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 said Thursday that he doubts the Mueller report will change much politically for 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.

"Politically, I’m not sure it will change much," he said while appearing on "Late Night with Seth Meyers." "If we really want to send Trumpism into the history books, the best thing we can do is defeat it decisively at the ballot box in 2020."

The mayor of South Bend, Ind., said, however, that he believes Trump's behavior as detailed in the report was "unethical" and "legally problematic."

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"There was a lot of behavior that was at best unethical and legally problematic, to put it charitably," he said. "The way that the attorney general conducted himself as though he were the personal attorney of the president was incredibly troubling too."

Mayor @PeteButtigieg offers @SethMeyers his reaction to the Mueller Report, and explains why his military background informs his opinion on Trump. pic.twitter.com/S5PUoMwtud — Late Night with Seth Meyers (@LateNightSeth) April 18, 2019

The Justice Department on Thursday released a redacted version of special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's report. Prior to the report's release, Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE held a press conference in which he defended Trump. Democrats and media figures have questioned whether the conference was appropriate.

Buttigieg officially launched his presidential campaign on Sunday. He is one of more than a dozen people competing for the Democratic Party's 2020 nomination.