President Trump’s social media director violated a law that bars federal officials from campaigning when he encouraged a Republican to run against Rep. Justin Amash, R-Mich., the Office of Special Counsel has concluded.

Dan Scavino, a close aide to Trump, tweeted in April that Amash should face “defeat” in his next primary because he had become a “big liability.” At the time, Amash was among a handful of House Freedom Caucus members who stood in the way of passing a healthcare reform bill.