Republican Rep. Markwayne Mullin of Oklahoma, a former professional mixed martial arts fighter, challenged Democratic lawyer Michael Avenatti to “meet him on the mat.”

Avenatti and Donald Trump Jr. have sparred on Twitter in recent weeks over special counsel Robert S. Mueller III’s Russia investigation and Avenatti’s rumored presidential ambitions. The rivalry took a surreal turn last week, when Avenatti challenged Trump Jr. to a “three-round mixed martial arts fight” with the proceeds going to charity.

Avenatti has positioned himself as an antagonist of the Trump administration since taking up the case of Stormy Daniels, a porn actress who seeks to void a nondisclosure agreement signed with the president days before the 2016 election.

The former cage fighter intervened Tuesday, offering to take on Avenatti himself.