Rep. Alexandria Ocasio-Cortez (D-N.Y.) on Tuesday called for White House senior adviser Stephen Miller to resign after leaked emails appeared suggest that he promoted white nationalist literature and offensive immigration stories.

“Stephen Miller, Trump’s architect of mass human rights abuses at the border (including child separation & detention camps w/ child fatalities) has been exposed as a bonafide white nationalist,” Ocasio-Cortez tweeted.

“He’s still at the White House shaping US immigration policy. Miller must resign. Now,” she added.