Trump slams Biden's 'mental capacity'

President TrumpDonald John TrumpWayfair refutes QAnon-like conspiracy theory that it's trafficking children Stone rails against US justice system in first TV interview since Trump commuted his sentence Federal appeals court rules Trump admin can't withhold federal grants from California sanctuary cities MORE on Friday said former Vice President Joe BidenJoe BidenThe Hill's Campaign Report: Runoff elections in Texas, Alabama set for Tuesday Biden campaign slams White House attacks on Fauci as 'disgusting' Biden lets Trump be Trump 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 WarrenIn politics, as in baseball, it ain't over till it's over Trump defends Roger Stone move: He was target of 'Witch Hunt' Democrats blast Trump for commuting Roger Stone: 'The most corrupt president in history' MORE (D-Mass.) and Sen. Bernie SandersBernie SandersOVERNIGHT ENERGY: EPA declines to tighten smog standards amid pressure from green groups | Democrats split on Trump plan to use development funds for nuclear projects| Russian mining giant reports another fuel spill in Arctic Biden lets Trump be Trump Democrats split on Trump plan to use development funds for nuclear projects 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 ButtigiegIn politics, as in baseball, it ain't over till it's over Biden campaign hires top cybersecurity officials to defend against threats Biden strikes populist tone in blistering rebuke of Trump, Wall Street MORE, who is surging in some polls, might become the nominee a "joke." He also mentioned Sen. Kamala HarrisKamala Devi HarrisHillicon Valley: Facebook considers political ad ban | Senators raise concerns over civil rights audit | Amazon reverses on telling workers to delete TikTok Senators raise concerns over Facebook's civil rights audit Biden's marijuana plan is out of step with public opinion MORE (D-Calif.), saying "I don't see Kamala."

— Updated at 9 a.m.