In a move that sent shockwaves through Capitol Hill, Sen. Jeff Flake (R-AZ) announced on Tuesday that he will not seek re-election at the end of his term.

Flake blamed the nastiness of U.S. politics under President Donald Trump the USA Today reports.

He also told The Arizona Republic that “there may not be a place for a Republican like me in the current Republican climate or the current Republican Party.”

“Here’s the bottom line: The path that I would have to travel to get the Republican nomination is a path I’m not willing to take, and that I can’t in good conscience take,” Flake said according to AZ Central. “It would require me to believe in positions I don’t hold on such issues as trade and immigration and it would require me to condone behavior that I cannot condone.”