Hillary Clinton’s presidential campaign released an ad Friday featuring several prominent Republicans raising concerns over Donald Trump’s recent statements on foreign policy.

The 30-second spot, titled “Unfit,” comes after one of the worst weeks for Trump’s presidential campaign so far. He began the week by criticizing Khizr and Ghazala Khan, the parents of a fallen war hero, after Khizr Khan spoke out against Trump’s xenophobia during the Democratic National Convention last week. Later in the week, MSNBC’s Joe Scarborough reported Trump had asked why the U.S. can’t just simply use nuclear weapons. And on Wednesday, Trump claimed to have seen footage of U.S. officials handing off $400 million in cash to Iran ― footage that may not even exist. (Trump eventually admitted he got this one wrong.)

The culmination of these and other alarming statements led some conservatives to speak out against the GOP nominee and question whether he is fit for the presidency. Clinton’s camp quickly seized on the backlash.

Clinton’s ad features a clip of conservative columnist Charles Krauthammer telling Fox News’ Bill O’Reilly he doesn’t think someone of Trump’s temperament should have access to the nuclear codes. It also includes George W. Bush-era CIA director Michael Hayden saying he’s “frightened” by the prospect of Trump living up to his campaign promises if elected.

Watch the ad below:

According to Clinton’s campaign, the ad will air nationally on cable networks.

Editor’s note: Donald Trump regularly incites political violence and is a serial liar, rampant xenophobe, racist, misogynist and birther who has repeatedly pledged to ban all Muslims ― 1.6 billion members of an entire religion ― from entering the U.S.