Transportation Secretary Sean Duffy and former Secretary of State Hillary Clinton traded barbs over the Department of Government Efficiency‘s involvement with improvements to the Federal Aviation Administration.

Clinton, who unsuccessfully ran against President Donald Trump in the 2016 election, has been a constant critic of both Trump administrations. Most recently, she took issue with Duffy’s announcement that DOGE, led by Elon Musk, would “plug in to help upgrade our aviation system.”