Utah Republican Sen. Mitt Romney is coming under scrutiny for a double standard with his apparent demand for closed-door witness testimony in a Senate investigation into Hunter Biden’s work for the Ukrainian energy company Burisma Holdings. Romney supported open witness testimony in the Senate impeachment trial of President Trump, when he was the sole Republican senator to vote for additional witnesses — with no stipulation that interviews be closed. Romney, a frequent foil to the president, now faces questions about whether he is inconsistent in his apparent demand for transparent government in the latter case but not the former. Romney...