Attorney General Loretta Lynch overruled FBI Director James B. Comey on Thursday, saying the Obama administration does support a ban on firearms sales to those on terrorist watch lists. Mr. Comey last year had told Congress that the ban could end up alerting suspected terrorists that they are being investigated, and that could “blow” the cases his agents are trying to build. But his superiors at the Justice Department rejected that, issuing a statement Thursday saying they want to see Congress approve the “no-fly, no-buy” plan Democrats are pursuing. “The amendment gives the Justice Department an important additional tool to...