President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Thursday dismissed the threats posed by former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE, Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.), former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) and others as they seek the Democratic nomination to challenge him in 2020.

Trump called Sean Hannity's show on Fox News, where the two men engaged in a roughly 45-minute conversation railing against the president's detractors and floating allegations about improper behavior by federal law enforcement.

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At the conclusion of the discussion, Hannity asked Trump to respond to the names of a handful of Democratic candidates with a couple words that came to mind.

Trump shared a rare public critique of Harris, telling Hannity that "she's got a little bit of a nasty wit, but that might be it."

Of Biden, he said he's landed on the derisive nickname "Sleepy Joe," suggesting that the former vice president lacks the energy to handle the presidency.

Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.), who along with Biden is polling at or near the top of most Democratic primary polls, has "a lot of energy," Trump said.

"But he’s got misguided energy, and he’s done very poorly in terms of the Senate," Trump said.

Trump cast doubt on the chances of O'Rourke's candidacy, calling it a "fluke" and arguing the former Texas congressman is "fading very fast."

"And Mayor Pete is not going to make it," Trump said of South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE, who has surged in recent polling. "I’m rooting for him, but he’s not going to make it."

The president has publicly expressed confidence about his abilities to defeat any candidate that emerges from a field of roughly 20 candidates vying for the Democratic Party's presidential nomination.

Recent polling of hypothetical 2020 matchups have shown Biden and Sanders leading or running neck-and-neck with Trump.