Former House Speaker Newt Gingrich (R-Ga.) criticized 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 on Sunday for “mishandling” the release of Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE’s memo outlining the firing of 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.

"First of all, I urge everybody to read the original Rosenstein memo about Comey, which Trump totally mishandled," Gingrich said during a panel on "Fox News Sunday,” according to the Washington Examiner.

Gingrich said Trump should have released the memo “in a state of shock.”

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“Let the country, through Sunday talk shows, deal with the memo. It's devastating. It's clear that if you got that memo and you're the president, you would have fired Comey,” Gingrich said.

Gingrich was referring to the three-page memo that Rosenstein wrote in May 2017 after Trump announced he had fired Comey, entitled “Restoring Public Confidence in the FBI.”

Rosenstein wrote that he "cannot defend the Director's handling of the conclusion of the investigation of Secretary Clinton's emails, and I do not understand his refusal to accept the nearly universal judgment that he was mistaken."

Gingrich, a vocal Trump ally, has ripped Rosenstein and the FBI, as well as 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 and his ongoing investigation into possible ties between the Trump campaign and Russia.

Last week, Gingrich called Mueller’s probe a “breakdown” of the U.S. Constitution.