President Trump issued his first veto threat of the immigration debate on Thursday, with the White House saying the plan being offered by Senate Democratic leaders and a handful of GOP rebels would make border security worse, not better. In a statement from press secretary Sarah Huckabee Sanders, the White House said the plan would prevent agents from going after illegal immigrants unless they arrive after June 30, 2018. Analysts have said that creates an incentive for people to flood the border now, hoping to get into the U.S. before the deadline — and it also protects perhaps 10 million...