Sen. Mitt Romney said Thursday that he will not endorse Donald Trump or anyone else in the 2020 presidential primary or general election.
Romney told CNN he would not back any candidate next year, and that he would not run himself.
"I'm not planning on endorsing in the presidential race," Romney, who has periodically sparred with Trump, told CNN in the Capitol. "At this stage, I'm not planning on endorsing in the primary or in the general."
Romney's statement adds more certainty about his plans in the presidential race after previously signaling he was unlikely to endorse a candidate in the 2020 elections. The decision by a party's previous nominee to avoid backing a sitting president is yet another norm-breaking episode in Trump's tumultuous time atop the Republican Party.
Romney is a friend of one of Trump's primary challengers, Bill Weld, who served as Massachusetts governor before Romney's term in office. In an interview in April, Romney called Weld a "superb governor" but declined to say if he would get behind the long-shot candidate.
During the 2016 election, Romney blasted Trump during a speech at the University of Utah, then wrote in his wife Ann's name on his presidential ballot later that year.