When asked about the recent resignation of President Donald Trump’s national security adviser, Michael Flynn, Defense Secretary James Mattis sounded unmoved about Flynn’s departure.

“Here’s the bottom line, ladies and gentlemen. I’m brought in to be the secretary of defense. I give the president advice on the use of military force,” he said, according to Yahoo News Washington correspondent Olivier Knox.

“I maintain good relations, strong relations … and so military-to-military relations with other ministries of defense around the world,” he added.

“And frankly, this has no impact. Obviously, I haven’t changed what I’m heading there for. It doesn’t change my message at all. And who’s on the president’s staff is who I will work with.”