The New York State Bar Association announced that it may force Rudy Giuliani out from its membership over his speech before last week’s deadly siege on the Capitol.

The association announced Monday it’s investigating the former New York City mayor, who is President Donald Trump’s personal attorney, because he called for a “trial by combat” at a rally Wednesday near the White House.

“Mr. Giuliani’s words quite clearly were intended to encourage Trump supporters unhappy with the election’s outcome to take matters into their own hands,” the association said in a statement.

After the rally, a group of pro-Trump supporters stormed the Capitol and disrupted Congress’ confirmation of President-elect Joe Biden’s election win. A Capitol Police officer and four other people were killed in the riot.

According to its bylaws, “no person who advocates the overthrow of the government of the United States, or of any state, territory or possession thereof, or of any political subdivision therein, by force or other illegal means, shall be a member of the Association.” And the NYSBA said Guiliani’s remarks at the rally were “intended to encourage Trump supporters unhappy with the election’s outcome to take matters into their own hands.”

“Their subsequent attack on the Capitol was nothing short of an attempted coup, intended to prevent the peaceful transition of power,” the NYSBA said.