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

President TrumpDonald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE said Thursday that former Vice President Joe BidenJoe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio 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 HannityFormer Florida attorney general calls Kyle Rittenhouse 'a little boy out there trying to protect his community' Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Cruz: Trump should nominate a Supreme Court justice next week 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 Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome 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.