Rep. Chip Roy (R-Texas) on Thursday asked Alexandria Ocasio-Cortez (D-N.Y.) to “immediately apologize” after she accused Sen. Ted Cruz (R-Texas) of “almost having [her] murdered.”

In a letter to House Speaker Nancy Pelosi (D-Calif.), Roy called Ocasio-Cortez’s behavior “completely unacceptable” and asked her to retract her comments.

“It has come to my attention that Representative Alexandria Ocasio-Cortez sent out a tweet a few hours ago in which she accused Senator Ted Cruz, in essence, of attempted murder,” Roy wrote.

He continued, “As a member of this body who disagreed with ‘objections’ to the electors and who has expressed publicly my concerns about the events leading to January 6th, it is completely unacceptable behavior for a Member of Congress to make this kind of scurrilous charge against another member in the House or Senate for simply engaging in speech and debate regarding electors as they interpreted the Constitution.”

“I ask you to call on her to immediately apologize and retract her comments.”

Earlier in the day on Thursday, Cruz agreed with Ocasio-Cortez’s call on Twitter for a congressional hearing about Robinhood‘s decision to restrict trading in GameStop shares.

“This is unacceptable,” Ocasio-Cortez wrote on Twitter Thursday. “We now need to know more about @RobinhoodApp’s decision to block retail investors from purchasing stock while hedge funds are freely able to trade the stock as they see fit. As a member of the Financial Services Cmte, I’d support a hearing if necessary.”

“Fully agree,” Cruz replied.

In response, Ocasio-Cortez slammed Cruz, saying he “almost had me murdered.”

“I am happy to work with Republicans on this issue where there’s common ground, but you almost had me murdered 3 weeks ago so you can sit this one out,” she tweeted. “Happy to work w/ almost any other GOP that aren’t trying to get me killed. In the meantime if you want to help, you can resign.”

Roy concluded his letter warning Ocasio-Cortez that if she does not apologize, alternative measures will have to be taken to condemn her actions.

“If Representative Ocasio-Cortez does not apologize immediately, we will be forced to find alternative means to condemn this regrettable statement. It is my sincere hope that we all stop this heightened rhetoric and move forward to actually do the work the American people sent us here to do.

You can follow Annaliese Levy on Twitter @AnnalieseLevy.