Are Amy Coney Barrett’s religious views fair game?

Some see the Constitution’s “no religious test” clause as preventing such inquiries. But others say asking about how religion shapes a nominee’s outlook isn’t necessarily discriminatory – and is, in fact, vital.

President Trump’s Supreme Court nomination of Amy Coney Barrett, a federal judge and former standout Notre Dame law professor, has set the stage for a high-stakes confirmation process.

Nominating anyone five weeks before the election would have been controversial. But Judge Barrett’s conservative Catholic background and membership in the People of Praise, a tightknit charismatic community, has raised...