Sen. Mitt Romney Willard (Mitt) Mitt RomneyBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power The Memo: Trump's strengths complicate election picture MORE (R-Utah), one of the more frequent Republican critics of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE, may not endorse the president for a second term next year, saying Friday he may stay out of the 2020 race altogether.

“I don’t think endorsements are worth a thimble of spit,” Romney told reporters in Utah, according to The Associated Press. “I wouldn’t be surprised if I stay out of the endorsements.”

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Romney, who was the Republican presidential nominee in 2012, has had a fraught relationship with Trump at times during the latter's political career. In 2016, when Trump won the White House, Romney wrote his wife’s name on his ballot.

The Utah Republican said Friday it’s still too early to issue any official endorsements, though he said while “it’s not a sure thing” he believes Trump is likely to win reelection in 2020 in part due to a strong economy.

Romney has voiced support for some of Trump’s policies, including his sweeping tax cut plan in 2017 and Supreme Court nominations, though the Utah Republican has emerged as a fierce critic of the president's rhetoric and trade policies.

“I have and will continue to speak out when the president says or does something which is divisive, racist, sexist, anti-immigrant, dishonest or destructive to democratic institutions,” Romney wrote in an op-ed last year. “I do not make this a daily commentary; I express contrary views only when I believe it is a matter of substantial significance.”