Former New York Mayor Rudy Giuliani blasted President Obama for attempting to negotiate with Iran on a nuclear deal, while the leaders of that country openly call for the destruction of Israel and encourage chants of “death to America.”

The only thing terrorist regimes such as Iran’s understand he explained, is “the exercise of power.”

Obama has long been weakening America’s standing in the world since he took office, this latest agreement with Iran being the latest example.

Via the Daily News:

“You can’t negotiate with a madman,” Giuliani told John Catsimatidis on AM970 of Iran Supreme Leader Ali Khamenei. “You can’t negotiate with a man who is calling for the destruction of the state of Israel, death to Americans.”

But because Obama and Secretary of State John Kerry negotiated with the rogue regime to achieve a landmark deal to curb the country’s nuclear program, terrorists across the world now think the U.S. is weak, he added.

“I think they once again believe we’re a country that can be taken advantage of … the only thing they understand, because they are insane, really, is the exercise of power,” Giuliani, an avowed Obama critic, said. “Not negotiation.”

“I’m so concerned about ISIS and al Qaeda and Iran and the President’s state of denial of the dangers that Iran poses to us,” he added. “It reminds me of the days before 9/11, when we were in a state of denial over Bin Laden, who declared war on us.”

Giuliani and presidential candidate George Pataki have said the Iran nuclear deal and the Obama administration in general have made America more prone to attack than even on the days leading up to 9/11.