President Trump on Monday weighed in on video of Sen. Mitt Romney (R-Utah) marching with protesters in Washington, D.C. a day earlier and saying “black lives matter.”

“Tremendous sincerity, what a guy. Hard to believe, with this kind of political talent, his numbers would ‘tank’ so badly in Utah!” Trump tweeted.

Many interpreted the president’s tweet as sarcastic, given his long-running feud with Romney, who has an approval rating above 50 percent in Utah. The senator was the lone Republican to vote in favor of convicting Trump on one article of impeachment earlier this year.