Arnold Schwarzenegger, a staunch Republican and former Governor of California, won't be voting for Donald Trump.
Yesterday a recording of Mr Trump in 2005 emerged, in which he boasts how easy it is to make sexual conquests when you're "a star" and that women let him "grab them by the p***y". He also talked about trying to bed married women.
The recording was made only months after he married his third and current wife, Melania.
Mr Trump apologised for the remarks, saying he isn't perfect.
In posts on Facebook and Twitter, Mr Schwarzenegger said 2016 would be the first time since he became a US citizen in 1983 that he wouldn't be voting for the Republican candidate.
"Like many Americans, I've been conflicted by this election," the Predator star wrote.
"I still haven't made by mind up about how exactly I will vote next month. I have been a proud Republican since I moved to America in 1968 and I heard Nixon's words about government getting off our backs, free trade, and defending our liberty with a strong military.
"That day I joined the party of Abraham Lincoln, Teddy Roosevelt, and Ronald Reagan.
"But as proud as I am to label myself a Republican, there is one label that I hold above all else - American. So I want to take a moment today to remind my fellow Republicans that it is not only acceptable to choose your country over your party - it is your duty."
Mr Schwarzenegger is ironically set to host The Celebrity Apprentice, which was previously helmed by Mr Trump.