Washington (CNN) The Florida Bar is investigating Republican Rep. Matt Gaetz after his threatening tweet last night about President Donald Trump's former lawyer Michael Cohen.

Francine Andía Walker, the group's director of communications, said the Florida Bar received a number of calls and emails regarding the tweet after it posted.

According to disciplinary guidelines for the group, which is the organization of all lawyers licensed by the Supreme Court of Florida to practice law in the state, the state bar's lawyer regulation arm must determine that an allegation against a bar member "would constitute a violation of the Rules Regulating The Florida Bar" before a probe is opened.

On Tuesday night, just hours ahead of Cohen's public testimony before the House Oversight Committee, Gaetz -- a Trump ally -- tweeted at Cohen, "Do your wife & father-in-law know about your girlfriends? Maybe tonight would be a good time for that chat. I wonder if she'll remain faithful when you're in prison. She's about to learn a lot..."

Read More