Transportation Secretary Sean Duffy threatened penalties for air traffic controllers who failed to show up for work for extended periods during the government shutdown.

Speaking with reporters on Tuesday, Duffy specified that his ire was not directed at all air traffic controllers who missed work during the shutdown period, but only those who “systemically weren’t doing their job.” He questioned the dedication and patriotism of those who continuously failed to show up for work during the shutdown, pledging to take action against them.