On Friday, Donald Trump questioned whether Mitt Romney is actually Mormon. “I have many friends that live in Salt Lake City — and by the way, Mitt Romney is not one of them,” Trump said during a Salt Lake City speech. ”Are you sure he’s a Mormon? Are we sure?”

This is the third time Trump has questioned the faith of one of his opponents, despite having criticized the practice of questioning other people’s faith, ABC’s George Stephanopoulos pointed out this morning during an interview with Trump. “Why do you keep doing it?” he asked.

Here’s Trump’s reply: