Democrats on Sunday demanded answers about the killing of top Iranian Gen. Qassem Soleimani as tensions mounted between the U.S. and Iran and Secretary of State Mike Pompeo insisted that the U.S. had faced an imminent threat. Senate Minority Leader Chuck Schumer, D-N.Y., told ABC's "This Week" he worried that Trump's decision "will get us into what he calls another endless war in the Middle East." He called for Congress "to assert" its authority and prevent Trump from "either bumbling or impulsively getting us into a major war." Speaking with "Fox News Sunday," Rep. Chris Van Hollen, D-Md., said public...