George Conway, the husband of White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE, said Monday that it would "unquestionably be grounds for impeachment" if 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 ordered former White House economic adviser Gary Cohn Gary David CohnGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Former national economic council director: I agree with 50 percent of House Democrats' HEROES Act MORE to pressure the Department of Justice to block the AT&T-Time Warner merger.

"If proven, such an attempt to use presidential authority to seek retribution for the exercise of First Amendment rights would unquestionably be grounds for impeachment," Conway tweeted.

If proven, such an attempt to use presidential authority to seek retribution for the exercise of First Amendment rights would unquestionably be grounds for impeachment. https://t.co/F1UANzeD2q — George Conway (@gtconway3d) March 4, 2019

Conway's remark comes after The New Yorker reported that Trump gave that directive to Cohn in the summer of 2017.

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Trump is thought to be opposed to the merger because Time Warner owns CNN, a news network Trump regularly derides and refers to as "fake news."

The New Yorker reported that Trump complained during a 2017 Oval Office meeting with then-chief of staff John Kelly John Francis KellyMORE and Cohn that no action had been taken on Trump's request to have the merger blocked.

“I’ve been telling Cohn to get this lawsuit filed and nothing’s happened! I’ve mentioned it fifty times," Trump reportedly said. "And nothing’s happened. I want to make sure it’s filed. I want that deal blocked!”

The Justice Department ultimately brought a lawsuit that year seeking to block the merger on antitrust grounds, but U.S. District Judge Richard Leon ruled last year that the merger could proceed. Last month, the U.S. Court of Appeals for the D.C. Circuit upheld that ruling, rejecting the Justice Department's effort to have Leon's ruling reversed.