Columbia University’s interim president is resigning from her position at the embattled Ivy League, just days she told the Trump administration she would implement a mask ban to not lose $400 million in federal funding — while privately promising faculty she would not put one in place.

Katrina Armstrong’s decision to step down came on the heels of her high-profile battle with the Trump administration over the prestigious New York school’s $400 million in federal funding, sources told the Wall Street Journal Friday.

The Post has reached out to Columbia and the White House for comment.

This is a developing story. Please check back for updates.