President Trump was briefed on new options for military strikes in Iran, a senior U.S. official confirmed Sunday. Mr. Trump appeared to lay out his red line for action on Friday when he warned that if the Iranian government began "killing people like they have in the past, we would get involved." "We'll be hitting them very hard where it hurts," he said at the White House. "And that doesn't mean boots on the ground, but it means hitting them very, very hard where it hurts." On social media, Mr. Trump offered his support for the protesters, saying that "Iran...