Former Democratic Sen. Bill Bradley of New Jersey announced Tuesday the creation of an anti-Trump super PAC, the Fifty Second Street Fund.

The group is spending $725,000 in Ohio on an ad called “Careful,” reminiscent of Lyndon Johnson’s famous “Daisy” ad from the 1964 presidential race against Barry Goldwater, with the aim of educating voters about what a nuclear war would mean.

The ad compares the deaths one nuclear bomb could cause to the population of Columbus, Ohio — one of the cities where the ad will air.

“Donald Trump’s finger on the nuclear button is a horrifying prospect,” Bradley, 73, who served three terms in the Senate from 1979 to 1997, said in a news release. “His temperament and absence of experience makes him a danger to all Americans.”

In addition to Columbus, the ad will air in the Toledo and Cincinnati media markets. The super PAC is also promoting the ad through paid digital advertising.