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 Friday asserted that his 2016 campaign had been "conclusively spied on" by the Obama administration while calling the charge akin to "treason" and demanding jail time for those behind it.

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In a tweet, the president said "nothing like this has ever happened" while calling for prison sentences.

"A really bad situation. TREASON means long jail sentences, and this was TREASON!" he continued.

My Campaign for President was conclusively spied on. Nothing like this has ever happened in American Politics. A really bad situation. TREASON means long jail sentences, and this was TREASON! — Donald J. Trump (@realDonaldTrump) May 17, 2019

The president's tweet comes days after 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 announced the appointment of a U.S. attorney to review the decisions that led to the establishment of an investigation into Trump's campaign and Russian election interference.

The attorney general infuriated many Democrats on Capitol Hill earlier this year when he asserted that "spying" on the Trump campaign had occurred in 2016, while declining to take a position on its legality. His choice of language has earned rebukes from former members of the Justice Department, including former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE.

Barr told The Wall Street Journal and Fox News in interviews published Friday that he had received insufficient answers from Justice Department personnel about the reasons why an investigation had been launched into the Trump campaign in the first place.

“Government power was used to spy on American citizens,” Barr told the Journal on Friday. “I can’t imagine any world where we wouldn’t take a look and make sure that was done properly.”

"I’ve been trying to get answers to the questions and I've found that a lot of the answers have been inadequate and some of the explanations I've gotten don't hang together, in a sense I have more questions today than when I first started," Barr added in his interview with Fox.

"People have to find out what the government was doing during that period. If we're worried about foreign influence, for the very same reason we should be worried about whether government officials abuse their power and put their thumb on the scale."