Sen. Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (D-Va.) suggested on Thursday that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE may be seeking to send a message to witnesses in the investigation into possible collusion between his campaign and Russia by issuing a flurry of pardons.

"The President’s ad hoc use of the pardon power is concerning enough," Warner, the top Democrat on the Senate Intelligence Committee, tweeted.

"But the possibility that he may also be sending a message to witnesses in a criminal investigation into his campaign is extremely dangerous. In the United States of America, no one is above the law."

The President’s ad hoc use of the pardon power is concerning enough. But the possibility that he may also be sending a message to witnesses in a criminal investigation into his campaign is extremely dangerous. In the United States of America, no one is above the law. — Mark Warner (@MarkWarner) May 31, 2018

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Warner's tweet came hours after Trump pardoned conservative writer Dinesh D'Souza, who pleaded guilty in 2014 to making illegal campaign contributions.

The White House said in a statement on Thursday that Trump believed that D'Souza, a staunch ally of the president, had been the "victim of selective prosecution for violations of campaign finance laws" and that he "accepted responsibility for his actions."

Trump also said on Thursday that he was considering a pardon for TV personality Martha Stewart and weighing commuting the sentence of former Illinois Democratic Gov. Rod Blagojevich.

Stewart was convicted in 2004 of lying to federal investigators about suspected securities fraud and served time in federal prison.

Blagojevich is currently serving out a 14-year prison sentence for a number of corruption charges, including trying to sell former President Obama's vacant Senate seat after he was elected to the White House in 2008.

Trump has already issued a number of pardons, including for former Arizona Sheriff Joe Arpaio and former Bush administration official I. Lewis "Scooter" Libby.

Warner isn't the only Democratic lawmaker to suggest that Trump could try to use his pardon power in connection to the Russia investigation.

Rep. Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (Calif.), the top Democrat on the House Intelligence Committee, introduced a measure in April that seeks to give Congress oversight of any pardon that Trump may grant to a subject of the probe.

And after Trump pardoned Libby, House Minority Leader Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) accused the president of signaling to his political allies "that obstructing justice will be rewarded."