Trump slams Biden's 'mental capacity'

President TrumpDonald TrumpPoll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary Biden flexes presidential muscle on campaign trail with Virginia's McAuliffe Has Trump beaten the system? MORE on Friday said former Vice President Joe BidenJoe BidenBiden authorizes up to 0M for Afghan refugees Poll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary Biden flexes presidential muscle on campaign trail with Virginia's McAuliffe MORE doesn't "have what it takes" to become president.

"It means mental capacity, it means a lot of different things," the president said in a phone call interview with Fox News. 

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The president predicted the Democratic nomination for president was between the three current front-runners: Biden, Sen. Elizabeth WarrenElizabeth WarrenPoll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary Overnight Defense: US launches another airstrike in Somalia | Amendment to expand Pentagon recusal period added to NDAA | No. 2 State Dept. official to lead nuclear talks with Russia Warren-backed amendment to expand Pentagon recusal period added to defense bill MORE (D-Mass.) and Sen. Bernie SandersBernie SandersPoll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary Overnight Defense: US launches another airstrike in Somalia | Amendment to expand Pentagon recusal period added to NDAA | No. 2 State Dept. official to lead nuclear talks with Russia US launches second Somalia strike in week MORE (I-Vt.).

Trump said he'd "love" to run against any of them.

Trump said former President Obama took Biden "off the trash heap" when he made him his running mate. "I used to call him 1 percent Joe because he never got more than 1 percent," Trump said. 

He referred to Warren as "Pocahontas" and said Sanders isn't doing well in the race. A Morning Consult/Politico poll released Wednesday showed both Biden and Sanders with double-digit leads among registered voters in a hypothetical match-up against Trump.

Trump additionally went on to call the idea that South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegJD Vance takes aim at culture wars, childless politicians Poll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary The Hill's Morning Report - High-profile COVID-19 infections spark new worries MORE, who is surging in some polls, might become the nominee a "joke." He also mentioned Sen. Kamala HarrisKamala HarrisJD Vance takes aim at culture wars, childless politicians Poll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary Ron Johnson: 'I may not be the best candidate' for 2022 midterms MORE (D-Calif.), saying "I don't see Kamala."

— Updated at 9 a.m.