Former House Speaker Newt Gingrich formally endorsed Sen. John McCain in a video released by the campaign, calling the longtime Arizona senator a “national treasure” and “somebody who’s making a real difference” as chairman of the Armed Services Committee.

Notably, Gingrich’s endorsement comes two days after Republican presidential nominee Donald Trump declined to endorse the senator. Trump specifically cited McCain’s lack of work in support of veterans in refusing to back him. However, Gingrich pushed back against that idea, saying in the 45-second-long video that he knows “how hard” McCain works in support of veterans and the United States military.