Alex Azar, the new secretary of health and human services, said Thursday that he would closely scrutinize a plan by Idaho to allow the sale of insurance that does not comply with the Affordable Care Act, an early test of how he will enforce a law he opposes. But he said it was too early to know what action he might take. “We’ll be looking at that very carefully and measure it up against the standards of the law,” Mr. Azar said at a hearing of the Senate Finance Committee. The plan presents Mr. Azar with a choice that he could face frequently in his new job: whether to try to shore up the health law or to “let Obamacare fail.”