Twisted Sister frontman Dee Snider said he can no longer maintain his friendship with Donald Trump. He said since Trump became president, he's revealed his true “belief system inside.”

The pair met when Snider began a three-season stint on Celebrity Apprentice in 2011. Even though their political positions were some distance apart, they became friends. Snider always maintained a liberal outlook, and objected when conservative Paul Ryan used Twisted Sister anthem “We’re Not Gonna Take It” as a campaign theme in 2012. Snider later gave Trump permission to use the song during his presidential campaign, but then changed his mind.

“I was on Donald Trump’s Celebrity Apprentice for three years,” Snider told Bolivian TV channel ATB. “I came to know him and his family socially. But it wasn’t until he ran for president that I discovered his belief system inside, and I disagree with what he believes. I absolutely disagree with what he believes. So it’s very difficult because we were friends before – but now that he speaks his true mind, I can’t be friends.”

You can watch the video above.

Snider identified Trump’s promise to build a wall on the U.S.-Mexico border and his anti-immigration stance as a key factor in his decision. “The United States is a country of immigrants,” he said. “Everybody there, except Native Americans, everybody is an immigrant. My family is immigrants. We’ve always welcomed immigrants and we should continue to welcome immigrants. So, a wall? Crazy. To say no to immigration? Crazy. This has made our country strong – all these people from all over the world have made the United States one of the strongest countries in the world. We can’t stop bringing people in now.”

Snider released a solo album, We Are the Ones, just before Twisted Sister broke up last year. He  recently announced a new collaborative project with Hatebreed's Jamey Jasta, with more details coming later.