Trump slams Biden's 'mental capacity'

President TrumpDonald John TrumpWarren unveils Native American policy plan Live-action 'Mulan' star spurs calls for boycott with support of Hong Kong police Don't let other countries unfairly tax America's most innovative companies MORE on Friday said former Vice President Joe BidenJoe BidenPoll: Support for Sanders among college students reaches highest level since April Obama has taken active interest in Biden's campaign: report The Hill's Morning Report — Trump and the new Israel-'squad' controversy 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 WarrenWarren unveils Native American policy plan Poll: Support for Sanders among college students reaches highest level since April Obama has taken active interest in Biden's campaign: report MORE (D-Mass.) and Sen. Bernie SandersBernie SandersPoll: Support for Sanders among college students reaches highest level since April The Hill's Morning Report — Trump and the new Israel-'squad' controversy Native American advocates question 2020 Democrats' commitment 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 ButtigiegPoll: Support for Sanders among college students reaches highest level since April Native American advocates question 2020 Democrats' commitment Hillicon Valley: Deepfakes pose 2020 test for media | States beg Congress for more election security funds | Experts worry campaigns falling short on cybersecurity | Trump officials urge reauthorization of NSA surveillance program MORE, who is surging in some polls, might become the nominee a "joke." He also mentioned Sen. Kamala HarrisKamala Devi HarrisPoll: Support for Sanders among college students reaches highest level since April Native American advocates question 2020 Democrats' commitment Fox News poll shows Trump losing to Biden, Warren, Sanders and Harris MORE (D-Calif.), saying "I don't see Kamala."

— Updated at 9 a.m.