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 said Wednesday that he would welcome the opportunity to run against Democratic presidential candidate 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, his first public acknowledgment of the South Bend, Ind., mayor's burgeoning candidacy.

In an interview with David Webb on SiriusXM, Trump speculated that he may end up campaigning for the presidency in 2020 against 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.), 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 or "the mayor from Indiana," referencing Buttigieg without mentioning him by name.

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"I think I'd like running against him, too," Trump said of Buttigieg. "But it'll be interesting to see it unfold."

The interview marked Trump's first direct comment on Buttigieg, who formally entered the Democratic field of prospective candidates on Sunday and has surged in recent polling.

The 37-year-old launched an exploratory committee earlier this year as a relative unknown in an increasingly crowded presidential primary field.

Since then, Buttigieg has attracted strong crowds at campaign events and raised an impressive $7 million for his campaign in the first quarter of 2019. That figure put him ahead of prominent candidates such as Sens. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) and Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.).

Buttigieg has made a number of comments criticizing Trump, saying earlier Wednesday that the president uses "white guy identity politics" to divide working- and middle-class Americans.

In addition to his first jabs at Buttigieg, the president in Wednesday's interview chided Sanders and Biden, two candidates he speculated a day earlier might be the two front-runners for the Democratic nomination.

I believe it will be Crazy Bernie Sanders vs. Sleepy Joe Biden as the two finalists to run against maybe the best Economy in the history of our Country (and MANY other great things)! I look forward to facing whoever it may be. May God Rest Their Soul! — Donald J. Trump (@realDonaldTrump) April 17, 2019

"I think I put out yesterday, it could be Bernie, and it could be Biden," Trump told Webb, who is a contributor to The Hill. "And I think Sleepy Joe's going to have a hard time. He's, you know, 1 Percent Joe. I don't think he's going to make it, and I don't, I don't know that Bernie — it may be Bernie has the most spirit over there right now."

Biden has yet to formally announce his candidacy, though he is widely expected to do so soon. He and Sanders have been at or near the top of most Democratic primary polls in recent months.

Trump appeared to be irked by Sanders's appearance Monday night on a Fox News town hall event, tweeting several times about the Vermont senator and questioning the network's audience selection.