President Donald Trump mishandled the release of Deputy Attorney General Rod Rosenstein’s memo outlining the firing of former FBI Director James Comey, former House Speaker Newt Gingrich said during a panel on “Fox News Sunday.”

Gingrich was referring to the three-page memo Rosenstein wrote in May 2017 after Trump announced Comey’s firing that read 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."

"First of all, I urge everybody to read the original Rosenstein memo about Comey, which Trump totally mishandled," Gingrich said.

"What Trump should have done is released that memo in a state of shock,” he added. “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.”

Trump’s dismissal of Comey resulted in the appointment of special counsel Robert Mueller.

Gingrich has slammed Mueller's probe, calling it "a breakdown" in the "concept of Constitutional rule of law."