Geraldo Rivera has known Donald Trump for more than four decades, including on “Celebrity Apprentice.”

For many of those years, he only had nice things to say about the former president. But certainly not anymore.

“…If you are a Republican, Donald Trump has made you a liar. He persuaded and intimidated tens of millions of people to act as if he was re-elected in 2020 and that the election was stolen. In furtherance of this Big Lie, Trump incited and unleashed the violent attack on the center of democracy, the U.S. Capitol, on January 6, 2021,” Rivera said in a lengthy post on X endorsing Kamala Harris for president.

“You may be inclined to vote for the former president anyway because he says he will cut your taxes, build the border wall, withdraw from NATO or impose tariffs on China. However, justifying voting for Trump will make you a liar if you adopt his big lie about the stolen election,” he continued. “Former President Trump is a sore loser who cannot be trusted to respect the Constitution. That’s why I’m voting for Kamala Harris as our 47th president.”

And in a recent television interview, the former Fox News host called Trump an “absolute racist.”

Rivera, once a friend of Trump's who broke up with him over the former president's false claims that he had won the 2020 election, said: “I do not believe under any circumstances that Donald Trump should be president of the United States again, And that to me is an important message.” “We are committed to delivering something to the American people by November 2024.”

In 2023, you'll quit as one of the lone liberal voices on Fox News' popular political battle show “The Five.”

Rivera had a colorful syndicated talk show that aired from 1987 to 1998 and hosted an evening news and interview show on CNBC in the late 1990s. After the terrorist attacks in September 2001, he was brought to Fox as a war correspondent by then-chairman Roger Ailes.

The Associated Press contributed to this report.