Trump slams Biden's 'mental capacity'

President TrumpDonald John TrumpConway defends herself against Hatch Act allegations amid threat of subpoena How to defuse Gulf tensions and avoid war with Iran Trump says 'stubborn child' Fed 'blew it' by not cutting rates MORE on Friday said former Vice President Joe BidenJoe BidenBiden, Eastland and rejecting the cult of civility Inslee unveils plan to fight fossil fuel pollution Biden lays out immigration priorities, rips Trump for 'assault on dignity' 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 Ann Warren2020 Democrat: 'My DM's are open and I actually read & respond' Group of wealthy Americans write open letter asking to be taxed more Inslee unveils plan to fight fossil fuel pollution MORE (D-Mass.) and Sen. Bernie SandersBernie SandersThe Hill's Morning Report - Crunch time arrives for 2020 Dems with debates on deck The Memo: All eyes on faltering Biden ahead of first debate Progressive group launches campaign to identify voters who switch to Warren 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 ButtigiegPeter (Pete) Paul ButtigiegGroup of wealthy Americans write open letter asking to be taxed more The Hill's Morning Report - Crunch time arrives for 2020 Dems with debates on deck The Memo: All eyes on faltering Biden ahead of first debate MORE, who is surging in some polls, might become the nominee a "joke." He also mentioned Sen. Kamala HarrisKamala Devi HarrisThe Hill's Morning Report - Crunch time arrives for 2020 Dems with debates on deck The Memo: All eyes on faltering Biden ahead of first debate 2020 primary debate guide: Everything you need to know ahead of the first Democratic showdown MORE (D-Calif.), saying "I don't see Kamala."

— Updated at 9 a.m.