Thomson Reuters
Former Republican presidential candidate Mitt Romney gestures as he speaks at the Republican National Committee Winter Meeting in San Diego, California
The former governor of Massachusetts and 2012 GOP presidential nominee will address the Hinckley Institute of
Romney has yet to endorse a candidate, although it was rumored last month that he'd endorse Florida Sen. Marco Rubio. Rubio's camp later denied those rumors.
In recent days, Romney has engaged in a back-and-forth with GOP frontrunner Donald Trump, whom he's denounced for failing to distance himself from a Ku Klux Klan endorsement and for not releasing his taxes.
"A disqualifying & disgusting response by @realDonaldTrump to the KKK. His coddling of repugnant bigotry is not in the character of America," Romney tweeted on Monday after Trump said he didn't know enough about former KKK Grand Wizard David Duke or white supremacists to denounce them.
Trump later said it was because of a faulty earpiece.
On taxes, Romney has repeatedly said Trump could be hiding a "bombshell" in his returns.
"Well, I think there's something there," he told Fox News host Neil Cavuto last week. "Either he's not anywhere near as wealthy as he says he is, or he hasn't been paying the kind of taxes we would expect him to pay. Or perhaps he hasn't been giving money to the vets or the disabled, like he's been telling us he's been doing."
Trump has unleashed multiple tirades against Romney on both social media and in public.
Last week, he tweeted that Romney was one of the "dumbest and worst" Republican candidates to ever run for president.
"I criticized Mitt Romney for losing that election. He should have won that election," Trump said during last week's GOP debate in Houston, Texas.
"He ran a terrible campaign," he added. "He was a terrible candidate. That's what I criticized Mitt Romney [for]. He ran one terrible campaign! That's an election that should have been won."