GOP Senate candidate Mitt Romney on Monday said that it is "too early" for him to say whether he would support President Trump in the 2020 presidential election.

Romney, who last week won the GOP nomination in the Utah Senate race, has gone back and forth on his praise of the president.

"It's too early to say who I will support," Romney said while appearing on MSNBC. "I did say I think he'll get reelected, that's not an endorsement."

The former governor of Massachusetts and 2012 presidential candidate was a harsh Trump critic during the 2016 race, calling him a "fraud" and a "phony" and urging Republicans not to support him. In May, he said that he did not see Trump as a "role model" for his grandchildren.

Last month, Romney penned an op-ed for The Salt Lake Tribune vowing to speak out against Trump when necessary, and said he would continue to oppose the president if he said something "racist or divisive."

But he has also praised the president in recent weeks, saying that his first year in office was "very similar" to what Romney's presidency would have looked like and that he thought it was "better than expected."

Trump congratulated Romney following his primary win. Romney is favored to win his bid for Senate in the heavily red state in November.