Trump says Biden has been 'brainwashed': 'He's been taken over by the radical left'

President TrumpDonald John TrumpDeWine tests negative for coronavirus a second time Several GOP lawmakers express concern over Trump executive orders Beirut aftermath poses test for US aid to frustrating ally MORE said Thursday that former Vice President Joe BidenJoe BidenBiden says Trump executive order is 'a reckless war on Social Security' Trump got into testy exchange with top GOP donor Adelson: report Blumenthal calls for declassification of materials detailing Russian threat to US elections MORE (D) has been “brainwashed” by the “radical left.” 

“Joe is just, look let's face it, he's been taken over by the radical left. He has no clue what they're doing,” Trump said in an interview with Fox News anchor Sean HannitySean Patrick HannitySunday shows preview: White House, congressional Democrats unable to breach stalemate over coronavirus relief Tennessee primary battle turns nasty for Republicans CNN's Ana Navarro to host Biden roundtable on making 'Trump a one-term president' MORE

“They brainwashed him, he doesn't know where he is, he doesn’t know what he's doing and our country will suffer. Our stock markets will crash, bad things will happen,” Trump added. 

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The president also referenced a “deal” he says Biden, the presumptive Democratic nominee, made with Sen. Bernie SandersBernie SandersThe Memo: Trump team pounces on Biden gaffes The Hill's Campaign Report: US officials say Russia, China are looking to sow discord in election Warren urges investment in child care workers amid pandemic MORE (I-Vt.).

Trump was seemingly referring to the Democratic platform released Wednesday by the Biden-Sanders Unity Task Force. The platform laid out recommendations on a number of key issues, but it fell short of Sanders’s push for radical change. 

Trump told Hannity that Biden is “worse than Bernie Sanders at his best.”

“He has been completely taken over, I think it’s because he doesn’t understand what's going on,” Trump said.  

Trump, 74, dismissed accusations that Biden, 77, isn’t fit for the job due to his age. The president said he knows “other people in their late 80s, early 90s” that are “100 percent mentally sharp.”

Trump also repeated his call for Biden to take a cognitive test, like the one Trump claims he “aced.” 

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“I took one very recently when the radical left was saying, ‘Is he all there, is he all there?’ I proved it, because I aced it. He should take the very same test,” Trump said. 

A spokesperson for the Biden campaign was not immediately available for comment in response to Trump’s attack. 

Biden has also attacked Trump’s cognitive ability and fitness for office.