The bass player for the now-defunct rock band R.E.M. wants to stop President Donald Trump from using the groups songs after Trumps reelection campaign played two of its tunes at a rally in Milwaukee Tuesday night.

R.E.M.s Mike Mills said Wednesday the band which broke up in 2011 after decades of success was exploring all legal avenues to prevent Trump from using their tunes at the political gatherings. Mills went on to characterize the president as a fraud and con man, saying the band does not condone the use of our music by him.

The R.E.M. songs Everybody Hurts and Losing My Religion played at Tuesdays event before Trump took the stage and celebrated his administration s assassination of Iran military leader Qassem Soleimani , one of the most powerful figures in the Middle East.

Soleimanis death escalated conflict between the U.S. and Iran and, many experts worry, intensifies the danger facing American assets and troops in Iraq and elsewhere in the Middle East.

Mills is a vocal opponent of Trump and his policies, often insulting him in tweets. On Sunday, he called Trump an Adderal-deranged idiot who is renting our troops out as mercenaries in response to Trumps questionable claims about Saudi Arabia paying for additional U.S. troops dispatched to that country.

Mills has railed about Trumps use of R.E.M. songs since 2015, when the New York businessman began his first presidential campaign.

Go f*** yourselves, the lot of youyou sad, attention grabbing, power-hungry little men, Mills tweeted that year. Do not use our music or my voice for your moronic charade of a campaign.

At that time, Trumps campaign was using R.E.M.s song Its the End of the World as We Know It (And I Feel Fine).

Other musicians and singers have pushed back against the use of their music in politics without prior approval, especially when they have been played at Trump events.

Adele, Rihanna, Aerosmith and Elton John are just a few pop stars who have urged the presidents campaign to stop using their material at such gatherings. Aerosmith and Rihanna have even sent Trump cease-and-desist letters, though it is hard to enforce this type of legal action.