Former Speaker Newt Gingrich (R-Ga.) wants Congress to investigate leaks from the intelligence community that have hurt President Trump's administration.

"House Senate [Intelligence] committees must open investigations of illegal leaks from intell community, deliberate effort to undermine President," Gingrich, a longtime Trump ally, tweeted Thursday.

House Senate Intell committees must open investigations of illegal leaks from intell community,deliberate effort to undermine President — Newt Gingrich (@newtgingrich) February 16, 2017

Trump himself has railed against leakers in recent days after a series of damaging leaks led to the ousting of his national security adviser and questions about his team's actions during last year's campaign.

Michael Flynn resigned Monday after reports, citing unidentified sources, that Flynn misled top White House officials about the contents of phone calls he had with Russia's ambassador to the U.S. before Trump was sworn in.

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And a New York Times report Tuesday said Trump's campaign had contact with Russian officials during the campaign.

Trump on Thursday called for media outlets to apologize about reporting leaked information.

"Leaking, and even illegal classified leaking, has been a big problem in Washington for years," the president tweeted.

"Failing @nytimes (and others) must apologize!"

He said the spotlight had "finally been put on the low-life leakers," adding that they "will be caught."