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 is considering changes to Justice Department protocol because of the surveillance of U.S. citizens in the investigation of the 2016 election, remarks likely to add to the debate around 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's charge that his campaign was spied upon.

In an interview with The Wall Street Journal, Barr confirmed that he was reviewing the Justice Department rules that surrounded the investigation, while offering no specifics on what changes could be on the way for the agency.

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

“Just like we need to ensure that foreign actors don’t influence the outcome of our elections, we need to ensure that the government doesn’t use its powers to put a thumb on the scale," Barr continued.

The attorney general made headlines in April when he discussed spying on the Trump campaign during a congressional hearing. Democrats objected to the use of the word, and Barr has faced criticism since then for describing the surveillance as spying.

But the attorney general has defended his remarks, saying he didn't believe the term spying had a pejorative meaning.

His comments about possible impropriety at the Justice Department come the same day as some of Trump's harshest rhetoric yet concerning the investigation into his campaign: In a series of tweets Friday, the president referred to the probe as "treason" and called for jail time for those responsible.

"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!" the president wrote Friday morning.

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

Barr has been the target of ire for weeks from congressional Democrats who argue he has worked to protect Trump in the wake of the release 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.

Some Democrats have accused Barr of misrepresenting the contents of Mueller's findings in his official summary released to Congress, as well as in his testimony before lawmakers and have called for his subsequent resignation.