Attorney George Conway slammed Donald Trump for a string of lies in his Twitter attack Sunday on the first GOP federal lawmaker to call for his impeachment.

“You never stop lying, do you?” the husband of senior White House aide Kellyanne Conway shot back in a tweet after Trump called Rep. Justin Amash (R-Mich.) a “loser” and a “total lightweight.”

Amash on Saturday tweeted a list of carefully considered reasons for impeachment, based on a meticulous reading of the report by special counsel Robert Mueller. He concluded that conduct detailed by Mueller was “impeachable,” that Attorney General William Barr “deliberately misrepresented the report,” and that “partisanship” was stopping GOP lawmakers from doing the right thing.

“Contrary to Barr’s portrayal, Mueller’s report reveals that President Trump engaged in specific actions and a pattern of behavior that meet the threshold for impeachment,” Amash wrote.

In his attack on Amash, Trump insisted in a tweet Sunday that the Mueller report was “strong on no collusion” and “no obstruction,” and “anyway how do you obstruct when there is no crime?” he asked.