The US has hit back at Holocaust-denying comments from Iran’s spiritual leader.

Ayatollah Ali Khamenei recently tweeted the offensive remarks, alleging that stifling western governments bar citizens from questioning the legitimacy of the Shoah.

“Unfortunately, these statements are nothing new,” Marie Harf, the State Department spokeswoman, said at the Wednesday briefing for reporters.

“They’re inflammatory. They’re, quite frankly, abhorrent. And it’s insulting to the millions of people who died in the Holocaust.”

“Even countries that claim 2 have freedom, set redlines on which they’re utterly strict,” a March 21 tweet from Khamenei’s account read. “Does anybody dare talk about #Holocaust in Europe? #freedom.”

“#Holocaust is an event whose reality is uncertain and if it has happened, it’s uncertain how it has happened,” a follow up tweet stated.

Holocaust denial out of Iran is nothing new, particularly from the Ayatollah. Past president Mahmoud Ahmadinejad was also notorious for his Holocaust denial and revisionism.