WASHINGTON – Attorney Michael Avenatti said Wednesday that Senate Judiciary Chairman Chuck Grassley is "far too stupid to lead such an important committee."

Avenatti blasted Grassley in response to the senator labeling him a "lawyer for the porn world" in an interview Tuesday night on Fox News.

Avenatti is best known for representing former porn star Stormy Daniels in her hush-money lawsuit against Donald Trump. But he also represented Julie Swetnick, who alleged that Brett Kavanaugh was present at high school parties where teenage girls were drugged and gang-raped.

Kavanaugh, who vehemently denied the allegations of sexual misconduct by Swetnick and other women, was narrowly confirmed by the Senate on Saturday as the newest Supreme Court justice.

"Chuck Grassley claimed last night that I have 'established a reputation as a lawyer for the porn world," Avenatti tweeted. "This shows how ignorant and out of touch with reality he is. Far too stupid to lead such an important (committee)."

Grassley, R-Iowa, said in the Fox News interview that Avenatti's reputation hurt Swetnick's credibility. The Senate Judiciary Committee conducted Kavanaugh's confirmation hearings.

"“I think with Avenatti’s reputation that he has established as a lawyer for the porn world, that that raised questions about the legitimacy of Swetnick," Grassley said.

However, the senator also said that, when it comes to sexual assault allegations, "they all gotta be taken very seriously, because until recent years there was never much thought given about it."

"And it’s a good thing that the #MeToo movement has come about because it has brought to the surface something that we ought to be talking about and be more cognizant of," Grassley said.

Swetnick said Sunday that she felt "re-victimized" by the way she was treated.

Kavanaugh accuser Christine Blasey Ford testified before the Judiciary Committee and accuser Deborah Ramirez was interviewed by the FBI, but Swetnick was not contacted by federal agents and was not asked to testify.

"As a sexual assault victim, I am disgusted and appalled by the way that I have been re-victimized over the last 2 weeks after I had the courage to come forward," Swetnick said in a statement.

More:Fight night? Avenatti proposes MMA bout against Trump Jr. for charity

More:Stormy Daniels says she regrets body shaming President Trump with graphic description

More:Chuck Grassley: Judiciary should have more women, because they 'are smarter than most male senators'