When David Crosby & Friends performed at The Regent Theatre in Arlington, Massachusetts on Monday, the show featured more than just his famous hits.

The singer spoke out against President Donald Trump during the show. Following the concert, an attendee reached out to the founding member of Crosby, Stills & Nash on Twitter, asking Crosby to stick to music.

"Don't you realize that you will piss off 1/2 of your audience or at least 1/3 in liberal areas when you do that?" the fan wrote in a tweet mentioning the singer.

In response, Crosby said:

If you’re a Trump dummy and you don’t like progressives

Don’t come to my show asshole https://t.co/Aglt0ONQ7a — David Crosby (@thedavidcrosby) November 14, 2017

In a following tweet, Crosby shared that he will do what he wishes during his performances.

Crosby has spoken against Trump for some time. In an interview with the IndyStar earlier this fall, he spoke of performing Neil Young's "Let's Impeach the President" while touring and compared Trump to previous presidents.

"We thought we had it bad with Bush, but now we have a guy who's 10 times worse than Bush," Crosby told the IndyStar. "I've been trying to write a song about Trump, man, but he's so egregiously bad that I haven't managed it, yet."