Well, this was only a matter of time.

Democrats have dropped a nuke on Donald Trump's head, in the form of a television ad set to air Friday in five battleground states where the race with Hillary Clinton is tightest. Called "I Love War," the spot shows images of war interspersed with Trump's own words, and no narration.

It opens with an image of soldiers' bodies being loaded into a helicopter during the Vietnam War, as Trump says, "I'm really good at war. I love war, in a certain way."

Next, a mushroom cloud appears, part of several frames of various nuclear weapons tests. Trump: "Including with nuclear weapons."

Then the images shift to marching ISIS fighters, with Trump's infamous boast at a campaign rally that he knows more about the Islamic terrorist organization than U.S. generals.

Trump is "too dangerous and unpredictable to ever be president," said Justin Barasky, spokesman for Priorities USA, the pro-Hillary super PAC behind the ad. It is scheduled to run in North Carolina, Ohio, Florida, Nevada and Iowa, beginning Friday, the super PAC said.

Not to put too fine a point on it, the Democrats have been intimating for months that Trump is too unstable to be trusted with nuclear weapons and life-or-death decisions. His own intemperate remarks on war have given them plenty of ammunition. The ad closes with the echo of Trump's saying he wants to be "unpredictable."

Priorites USA says the ad is similiar to 1964's famous "Daisy" ad that attacked Republican Barry Goldwater with the image of a little girl plucking daisies in a field as a voice reads a countdown. Then everything's obliterated by a mushroom cloud. "Daisy" was yanked from the air almost immediately, but is regarded as one of the most memorable and effective political ads ever because it went viral years before that term became commonplace.