'A loud, nasty thin-skinned fraud': Elizabeth Warren launches stinging attack on Trump after she follows Obama's endorsement to finally get behind Hillary... as Bernie edges closer to letting go 

After sitting out the Democratic primaries, Sen. Elizabeth Warren endorsed Hillary Clinton for president on Thursday.

'I'm ready to get in this fight and work my heart out for Hillary Clinton to become the next president of the United States and to make sure that Donald Trump never gets anyplace close to the White House,' she told cable talk show host Rachel Maddow on MSNBC. 

Her moment of jumping off the fence came just hours after President Barack Obama gave Hillary Clinton his own formal endorsement in a video, saying 'I don't think there's ever been someone so qualified to hold this office.'

Warren has loomed in the background of Clinton's hard-fought primary against Sen. Bernie Sanders.

The senators are both darlings of the progressive left, but Warren seemed destined to embrace Clinton, woman to woman, however reluctantly. 

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Sen. Elizabeth Warren, D-Mass. gestures to the crowd after speaking at the American Constitution Society for Law and Policy 2016 National Convention on Thursday in Washington where she blasted Trump

A fired-up Warren endorsed Hillary Clinton on Thursday during an appearance on MSNBC

That's the ticket: Clinton and Warren talk during a confirmation hearing at the Senate Foreign Relations Committee in 2013

She resisted repeated 'draft Warren' efforts to get into the race, only to watch Sanders' own campaign transform into a nationwide movement.

Warren was the only female Democratic senator not to be swept up by the Clinton juggernaut – until Thursday.

'Having a female fighter in the lead is exactly what this country needs,' she said on MSNBC.

'For 25 years ... the right wing has been throwing everything they possibly can at her. What she's done is she gets back up, and she gets back in the fight. You also have to be willing to throw a punch, and there are a lot of things people say about Hillary Clinton, but nobody says she doesn't know how to throw a punch.'

Warren later Thursday launched into an attack on Trump while speaking at the American Constitution Society for Law and Policy 2016 National Convention. 

Warren used the far-left safe harbor of the Rachel Maddow Show to publicly embrace Clinton

She pointed to The Donald's comments about U.S. District Judge Gonzalo Curiel who is overseeing two fraud cases against Trump University - calling the presumptive GOP presidential nominee, saying: 'Donald Trump is a loud, nasty, thin-skinned fraud who has never risked anything for anyone and who serves no one but himself.'

She added: 'Trump is picking on someone who is ethically bound not to defend himself – exactly what you'd expect from a thin-skinned, racist bully.'

Trump has said that Curiel should be ashamed of himself but Warren was quick to point the finger at Trump. 

'No, Donald – you should be ashamed of yourself, ashamed.

'Ashamed for using the megaphone of a Presidential campaign to attack a judge's character and integrity simply because you think you have some God-given right to steal people's money and get away with it. You shame yourself and you shame this great country.' 

Vice President Joe Biden also echoed Warren's remarks at the event, calling Trump's conduct 'reprehensible,' 'racist' and that the situation 'smacks of authoritarianism'. 

Warren speaks at the American Constitution Society for Law and Policy 2016 National Convention

Warren launched into an attack on Trump, pictured, while speaking at the American Constitution Society for Law and Policy 2016 National Convention on Thursday

Warren has increasingly been using criticism of Curiel to launch a broadside against congressional Republican leaders and Trump.

Republican Senate Majority Leader Mitch McConnell of Kentucky and House Speaker Paul Ryan of Wisconsin have condemned Trump's claims that Judge Curiel can't preside fairly over a case involving Trump University because the U.S.-born Curiel is of Mexican descent and Trump wants to build a wall with Mexico.

'Judge Curiel is one of countless American patriots who has spent decades quietly serving his country, sometimes at great risk to his own life. Donald Trump is a loud, nasty, thin-skinned fraud who has never risked anything for anyone and serves nobody but himself. And that is just one of the many reasons why he will never be president,' Warren says. 

Warren withheld her endorsement for months, as every other female Democratic senator got on board. Pictured above on Thursday

During the MSNBC interview Warren also praised Sanders, singling him out for broadening the Democratic Party's appeal to a new audience of young and politically hungry progressives.

'He brought millions of people into the political process. Millions into the Democratic party, and for me, that's what this is all about,' Warren said.

'I also think what Bernie Sanders did was just powerfully important. He ran a campaign from the heart, and he ran a campaign where he took those issues and really thrust them into the spotlight.'

Sanders had today met with Obama before the President announced he was backing Clinton. After the meeting Sanders committed to staying in the Democratic race until the last primary but said he would work with Clinton to ensure Trump does not become president.

Sanders and his wife Jane conclude a rally outside of RFK Stadium in Washington after his meeting with Obama on Thursday

Warren praised Sanders for appealing to a young and politically hungry progressives. Above Sanders is pictured at a rally in Washington on Thursday after meeting with Obama

Sanders said he would meet with her 'in the near future to see how we can work together to defeat Donald Trump.'

'I spoke briefly to Secretary Clinton Tuesday night, and I congratulated her on her very strong campaign,' he told reporters. 

After Obama met with Sanders he endorsed Clinton today in a video the Democratic presidential candidate posted to her Twitter.

It had been shot on Tuesday but was not released until today.

In it Obama praised Clinton and congratulated her 'on making history' as the first female Democratic nominee.

'I don’t think there’s ever been someone so qualified to hold this office. She’s got the courage, the compassion, and the heart to get the job done,' the president said.

Sanders is seen after meeting with Obama in the Oval Office to discuss the campaign with Obama

Obama and Sanders are seen above today at the Oval Office. After their meeting Obama released a video endorsing Clinton

Clinton said in a follow up tweet, 'Honored to have you with me, @POTUS. I'm fired up and ready to go! -H'. She also shared a Snapchat saying that the president says 'I'm with her' along with a picture of Obama and various speech bubbles offering backing her.

She also shared a Snapchat of his endorsement. 

Obama will hold his first campaign event with Clinton on Wednesday in Green Bay, Wisconsin, after the last Democratic primary on Tuesday in Washington, D.C. 

President Barack Obama endorsed Hillary Clinton for president in a video shot Tuesday but not released until today, pictured above

In the video Obama lists the reasons why he believes she is the right person for the job and among them says 'she's got courage'

Clinton shared a Snapchat on Thursday after Obama's endorsement. The president said: 'I don't think there's ever been someone so qualified to hold this office'

As Clinton now focuses on uniting her fractured party after winning the California primary, forging a united front with Warren could help disgruntled Sanders supporters who are still licking their wounds.

There has even be a fresh round of talk about putting Warren on the ticket with Clinton, where she could serve as a younger alternative to the 74-year-old Sanders who doesn't have some of the baggage of being a Democratic socialist.

Senate Minority Leader Harry Reid of Nevada has reportedly warmed to the prospect of Warren running on Clinton's ticket and favors the scenario. 

He even commissioned a review of how to minimize the impact of Massachusetts law that governs Senate vacancies, since the state's Republican governor would get to appoint Warren's replacement if she left the Senate.

Several powerful unions, including the United Steelworkers, also have come on board.

Republican National Committee spokeswoman Lindsay Walters responded to the news by saying: 'By endorsing Hillary Clinton, Elizabeth Warren has shown herself to be a sellout. Whether it's the Wall Street speech transcripts she refuses to release, her ties to the fossil fuel industry, or coziness with big banks, Hillary Clinton represents everything Elizabeth Warren supposedly stands against.'

Hillary Clinton is assembling a powerhouse team of surrogates, including Warren, Sanders, President Obama, and first lady Michelle Obama – not to mention her own husband Bill Clinton

But the far-left Massachusetts Democrat says McConnell and Ryan are really no better than Trump on the issue of judges.

She cites what she contends is McConnell's blockade of President Barack Obama's judicial nominees including Supreme Court pick Merrick Garland, and Ryan's acquiescence in the strategy.

'Paul Ryan and Mitch McConnell want Donald Trump to appoint the next generation of judges. They want those judges to tilt the law to favor big business and billionaires like Trump. They just want Donald to quit being so vulgar and obvious about it,' Warren says.

'Donald Trump chose racism as his weapon, but his aim is exactly the same as the rest of the Republicans. Pound the courts into submission to the rich and powerful.' 

The liberal lawmaker increasingly has tangled with Trump, taking on a role that she seems able to execute more effectively than other Democrats, including presumptive presidential nominee Hillary Clinton.

Warren is the only female Democratic senator yet to officially back Clinton, but intends to make a formal endorsement in coming days, two sources with knowledge of her plans told The Associated Press late Wednesday. They spoke on condition of anonymity because they were not authorized to publicly discuss the matter.

Warren's ardent base of liberal supporters includes many who also backed Vermont Sen. Bernie Sanders in the 2016 race and may follow her lead more than that of any other leading Democrat, except perhaps for Obama.

'Trump isn't a different kind of candidate. He's a Mitch McConnell kind of candidate,' Warren said in her prepared remarks. 'Exactly the kind of candidate you'd expect from a Republican Party whose 'script' for several years has been to execute a full-scale assault on the integrity of our courts.'

Democrats and Republicans are in a seemingly endless dispute on judicial nominations, with each side claiming the other has been more obstructionist on the issue. Garland's nomination has languished since March while the Supreme Court, with eight justices instead of nine following Antonin Scalia's death, has issued a number of 4-4 rulings.

On Wednesday, Warren stood up on the Senate floor to challenge McConnell over the issue and try to move nomination votes by unanimous consent, but he denied her request and disputed her arguments.

'President Obama has had many more judicial nominees confirmed than President Bush did at the same point in his presidency,' McConnell said.

'And we'll continue to process his judicial nominations, but the minority is not going to dictate to the majority when and how we will do so.'