George Conway, husband of White House adviser Kellyanne Conway, at the White House on April 17, 2017. Chip Somodevilla/Getty Images

George Conway, husband to White House adviser Kellyanne Conway, slammed the White House's letter refusing to cooperate in House Democrats' impeachment inquiry as "trash."

The letter was "an excuse to prevent evidence, damning evidence, from reaching the public," he said on CNN political analyst Preet Bharara's podcast, which airs Thursday and was shared in advance with CNN.

"This was trash," Conway said. "The thrust of (the letter) is that there are some kind of constitutional obligations that the House has failed to meet that therefore render its impeachment inquiry illegitimate and unconstitutional, which is complete nonsense, because all the Constitution says is that the House has the sole power over impeachment."

He added that the letter "virtually guarantees" that Trump will be impeached, calling it "a disgrace to the country, a disgrace to the presidency, and a disgrace to the legal profession."

A vocal conservative lawyer, Conway is often at odds with Trump -- his wife's boss. He previously called Trump "a racist president" in a Washington Post op-ed; Kellyanne Conway told Fox News shortly afterward, "I totally disagree. I work with this President. I know him."