A former CIA director compared US immigration policy to Nazi Germany in an ominous Tweet.

“Other governments have separated mothers and children,” Former CIA and NSA chief Michael Hayden wrote on Saturday, along with a black and white photo of the Birkenau concentration and death-camp in Poland.

Hayden’s tweet appeared to be a response to the Trump administration’s new “zero-tolerance” policy of forcibly separating children from their parents if they cross the southern border illegally.

Some twitter users thought Hayden’s comparison was a step too far.

“This is the farthest, most abstract reach of the day,” wrote @jefethasavage. “PLEASE explain how enforced immigration laws are equal to enslavement and mass genocide.”

While President Trump has repeatedly blamed democrats in Congress for the policy, his Attorney General, Jeff Sessions, cited the bible as justification for it. In response, New York archbishop Cardinal Timothy Dolan on Friday called the immigration crackdown “unbiblical.