Homeland Security Secretary Jeh Johnson said Sunday that he was “devastated” by the recent shooting at Fort Hood and will work to do more to prevent mass shootings.

“I was devastated. It’s Army bases, it’s Navy installations, it’s schools,” he said on “This Week with George Stephanopoulos.” “I think we need to do more. I want solutions before I leave office.”

Another big concern for him, he said, is airport security, prompted by a boy hiding in the wheel well of an aircraft during a flight to Hawaii a few weeks ago.