Iranian President Hassan Rouhani mocks Donald Trump, saying the White House is “afflicted by mental retardation,” the Washington Post reports.

Rouhani’s mockery comes after Trump announced he was imposing sanctions on supreme leader Ayatollah Khomeini, who has been dead since 1989. He was referring to Ayatollah Ali Khamenei.

“The White House actions mean it is mentally retarded,” Rouhani said in a speech on state television. “Tehran’s strategic patience does not mean we have fear,” he added.

“Imposing useless sanctions on Iran’s Supreme Leader and the commander of Iran’s diplomacy is the permanent closure of the path of diplomacy,” Foreign Ministry spokesman Abbas Mousavi tweeted.

“Trump’s desperate administration is destroying the established international mechanisms for maintaining world peace and security.”