WASHINGTON (AP) – House Speaker Paul Ryan is airing a campaign ad in which he says he is “committed to securing our borders” with an image of a fence as Republican presidential nominee Donald Trump repeatedly promises to build a wall along the U.S.-Mexico border.

The ad comes a day after Trump thanked Ryan’s primary challenger Paul Nehlen (KNEE-lin) in a tweet. Nehlen, a longshot candidate who hopes to knock out Ryan, defended Trump in the face of criticism over his dispute with Muslim parents of a decorated Army veteran killed in Iraq in 2004.

The primary is Aug. 9.

Ryan’s ad, the third in his race against Nehlen, is titled “A Safe America.” The incumbent speaks directly to the camera, calls the U.S. an exceptional nation and vows to do what’s necessary to protect the U.S. from terrorists who “want to destroy our freedom and security.”