Avenatti fired back:  

Later, for good measure, Avenatti challenged both the president’s son to an MMA fight for charity: 

When someone asked if they would be using protective headgear in the theoretical matchup, Avenatti replied:  

The Trumps have not responded to the challenge.

CORRECTION: A previous version of this story indicated Avenatti challenged both President Donald Trump and Donald Trump Jr. to the fight.