Rep. Markwayne Mullin, R-Okla., said he would be “happy to meet” attorney Michael Avenatti “on the mat,” after Avenatti suggested he go against Donald Trump Jr. in a mixed martial arts fight.

“It’s ridiculous that @MichaelAvenatti would even challenge @DonaldJTrumpJr to a fight,” Mullin, a former professional mixed martial arts fighter, tweeted Tuesday. “But if he’s looking for a publicity stunt, I‘d be more than happy to meet him on the mat.”

Avenatti reportedly proposed last week during the Vanity Fair New Establishment Summit that he was “in” on a three-round mixed martial arts fight with Trump Jr. in which proceeds would go toward charity.

Later, Avenatti responded to an NBC reporter who tweeted about the proposition and said: “This would be for two great causes. I’m in.”

Mullin is a staunch defender of President Trump and traveled with Trump Jr. during the 2016 campaign.

“Congressman Mullin has always been supportive of charitable causes,” a spokesperson for Mullin said, according to Tulsa World. “As a former MMA fighter, he would welcome any opportunity to raise money for good causes while participating in a sport that he loves.”

Avenatti, who is representing porn star Stormy Daniels in a legal battle with Trump over an alleged extramarital affair, has been critical of Trump and is considering running against him in 2020.