Eric Trump can't keep his eyes off wife Lara's growing baby bump just a month before she's due as they attend the president's rally in West Virginia

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Lara Trump showed off her baby bump in a colorful long dress as she and husband Eric arrived for her father-in-law President Trump's rally in West Virginia.

The 33-year-old and her husband, the president's son Eric, was spotted walking across the South Lawn of the White House to board Air Force One to West Virginia on Thursday.

The Trumps, who are expecting their first child next month, were joining President Donald Trump in West Virginia for a Make America Great Again rally. 

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Eric Trump couldn't keep his eyes off his wife Lara and her baby bump as they walked across the South Lawn of the White House on Thursday

Lara looked stunning in a black, white and pink dress with flora and fauna designs, and white stilettos

Lara looked stunning in a black, white and pink dress with flora and fauna designs, and white stilettos.

While Eric kept it smart in a blue suit, although he flashed a colorful red lining, and blue and white tie.

The 33-year-old couldn't keep his eyes of Lara's baby bump as they made their way onto the presidential plane. They were joined on the plane by Ivanka Trump's husband Jared Kushner.

When the couple arrived at Tri-State Airport, West Virginia on Thursday afternoon, they gave a wave to the waiting crowds as they disembarked Air Force One and made their way to the rally at Big Sandy Superstore Arena in Huntington. 

Eric Trump, center, waves as he and his wife Lara Yunaska, left, and White House adviser Jared Kushner, right, walk down the steps of Air Force One at Tri-State Airport in Huntington 

The Trumps, who are expecting their first child next month, were joining President Donald Trump in West Virginia for a Make America Great Again rally

Lara also took a moment to show off her baby bump as she flashed a huge smile for the cheering audience at the rally before the president took the stage.

At the coal rally, Trump addressed residents of the state, and maintained the Democrats are stoking Russian allegations, before Gov Jim Justice announced his switch to become Republican.  

'The Russia story is a total fabrication. An excuse for the greatest loss in the history of politics,' Trump told the crowd as he referred to Hillary Clinton's shocking defeat last November. 

'It makes them feel better when they have nothing else talk about. What the prosecutors should be looking at are Hillary Clinton's 33,000 deleted emails,' Trump said as the crowd started to chant 'lock her up'. 

'We didn't win because of Russia, we won because of you.' 

Trump also boasted about keeping his promises made on the 2016 campaign trail.  

Lara also took a moment to show off her baby bump as she flashed a huge smile for the cheering audience 

Eric Trump, son of US President Donald Trump, watches as his wife Lara Trump arrives during a Make America Great Again Rally at Big Sandy Superstore Arena in Huntington 

Lara Trump, Trump's daughter-in-law, arrived during his Make America Great Again Rally in Huntington

At the rally, Lara also decried the 'crazy story about Russia'. 'It's so crazy, you have no idea,' she said

'As you have seen, I have kept that promise as President,' he told attendees at the rally at the Big Sandy Superstore Arena in Huntington.

'We are putting our coal miners back to work. We have ended the war on beautiful, clean coal. We have stopped the EPA intrusion. American coal exports are already up.'

Trump has already declared his intent to run again in 2020, and his reelection campaign is already up and running, including raising money and hosting events across the country.

To date, the president has held campaign rallies in Florida, Tennessee, Kentucky, Pennsylvania, Iowa and Ohio.

Thursday's event is Trump's seventh campaign rally in roughly six months. 

President Donald Trump traveled to West Virginia Thursday evening to address residents of the state during a coal rally, in which he maintained the Democrats are stoking Russian allegations as Gov Jim Justice announces he is switching sides to become Republican

'The Russia story is a total fabrication. An excuse for the greatest loss in the history of politics,' Trump told the crowd as he referred to Hillary Clinton's shocking defeat last November

Meanwhile, the former real estate mogul is said to be excited at the prospect of welcoming his seventh grandchild into the world. 

Lara and Eric were vacationing in Aspen in March when they revealed that they are expecting their first child — a baby boy — together.

'It has been an amazing year for the Trump family and we couldn't be more excited about this next big step in our life,' the couple told Daily Mail Online. 'We are thrilled to bring a baby boy into the world this September.'

Lara, who is due in September, admitted she was surprised by how 'exhausted' she was in the beginning of her pregnancy because she is a 'very active person'.

However, the former Inside Edition producer said she is feeling 'really good now', and she couldn't resist gushing about what an 'amazing dad' Eric is going to be.

Of course, Eric has had plenty of parenting practice thanks to his older brother and sister.

Donald Trump Jr. has five children with his wife Vanessa, while Ivanka Trump has three children with her husband Jared Kushner.

He told his supporters that they 'are doing great' and 'I'm so proud of you.' 'We've added more than 1 million new jobs and the good news keeps pouring in,' Trump said before telling the audience that 'we have a very important announcement tonight'

Trump then blasted lawmakers on his failed attempt to repeal and replace Obamacare as his supporters (pictured)