President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE lit into Democratic presidential contender Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) in a series of tweets on Tuesday, in which he attacked the senator as “crazy” and took aim at his wealth.

“Many Trump Fans & Signs were outside of the @FoxNews Studio last night in the now thriving (Thank you President Trump) Bethlehem, Pennsylvania, for the interview with Crazy Bernie Sanders,” Trump said in the first of a string of tweets on Tuesday evening.

“Big complaints about not being let in-stuffed with Bernie supporters. What’s with @FoxNews?” he claimed without evidence.

Many Trump Fans & Signs were outside of the @FoxNews Studio last night in the now thriving (Thank you President Trump) Bethlehem, Pennsylvania, for the interview with Crazy Bernie Sanders. Big complaints about not being let in-stuffed with Bernie supporters. What’s with @FoxNews? — Donald J. Trump (@realDonaldTrump) April 17, 2019

A Fox News spokesperson said in a statement to The Hill that the Sanders town hall "was a ticketed event and featured a diverse audience."

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The president went on to call out the senator over his wealth after Sanders recently revealed that he has become a millionaire from the profits he received from his best-selling book.

“Bernie Sanders and wife should pay the Pre-Trump Taxes on their almost $600,000 in income. He is always complaining about these big TAX CUTS, except when it benefits him,” Trump tweeted.

“They made a fortune off of Trump, but so did everyone else - and that’s a good thing, not a bad thing!” Trump, who has an estimated net worth of $2 billion and proclaims to be a self-made billionaire, also wrote.

Bernie Sanders and wife should pay the Pre-Trump Taxes on their almost $600,000 in income. He is always complaining about these big TAX CUTS, except when it benefits him. They made a fortune off of Trump, but so did everyone else - and that’s a good thing, not a bad thing! — Donald J. Trump (@realDonaldTrump) April 17, 2019

He also predicted in another tweet that both Sanders and former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE, who have emerged as front-runners in a crowded field of Democratic presidential contenders, would be the “two finalists to run against maybe the best Economy in the history of our Country.”

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“I believe it will be Crazy Bernie Sanders vs. Sleepy Joe Biden as the two finalists to run against maybe the best Economy in the history of our Country (and MANY other great things)!” he wrote.

“I look forward to facing whoever it may be. May God Rest Their Soul!” the president added.

I believe it will be Crazy Bernie Sanders vs. Sleepy Joe Biden as the two finalists to run against maybe the best Economy in the history of our Country (and MANY other great things)! I look forward to facing whoever it may be. May God Rest Their Soul! — Donald J. Trump (@realDonaldTrump) April 17, 2019

Trump's criticism arrives as the Vermont Independent leads Democratic presidential contenders in a new Emerson poll, which has him at 29 percent in the lead compared to the 24 percent Biden now holds in second place.