A solemn video debuted Wednesday at the Democratic National Convention trotted out members of Donald Trump’s own party and former military leaders to portray the GOP nominee as hapless, erratic and just plain ignorant about what it takes to be commander-in-chief.

In the video, quotes from former Presidents Harry Truman, Dwight D. Eisenhower, John F. Kennedy, and Ronald Reagan, set to somber music, emphasize the critical seriousness of choosing the President.

Retired U.S. military leaders said high-ranking current officers are worried about the “toxic leadership” Trump would bring to the White House, coupled with his reliance on “gut instinct” and penchant for saying “stupid, reckless” things.

The video also featured multiple clips from former GOP nominee Mitt Romney’s anti-Trump speech in March.

Watch the full video below: