Mitt Romney will take aim at Donald Trump in Thursday speech. Trump has already hit back.

Donald Trump just released an attack ad against Mitt Romney
(Image credit: Stan Honda/AFP/Getty Images)

Mitt Romney is taking his rebukes of Republican presidential frontrunner Donald Trump from Twitter and cable news to a bigger stage on Thursday morning, giving a speech on "the state of the 2016 presidential race" at the University of Utah. In his speech, Romney will likely hit Trump on his refusal to release his tax returns and his waffling over support from David Duke and the Ku Klux Klan, sources tell Reuters. He won't endorse anyone, though he's expected to say nice things about Trump rivals Marco Rubio, Ted Cruz, and maybe John Kasich.

Donald Trump isn't taking this lying down. On Wednesday night, Trump took the unusual step of releasing an attack ad against Romney, posting it at his official Facebook page:

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Peter Weber, The Week US

Peter has worked as a news and culture writer and editor at The Week since the site's launch in 2008. He covers politics, world affairs, religion and cultural currents. His journalism career began as a copy editor at a financial newswire and has included editorial positions at The New York Times Magazine, Facts on File, and Oregon State University.