//Split Congress Poses New Obstacles to Trump

Split Congress Poses New Obstacles to Trump

WASHINGTON—Democrats took control of the House of Representatives, while Republicans retained their grip on the Senate, presenting challenges for President Trump on one front but ensuring robust support on another.

Democrats won victories in key House races from coast to coast, flexing strength in suburban districts full of affluent, educated voters—enough to tip control of the chamber to them for the first time in eight years. In the Senate, however, Republicans appeared likely to expand their majority, delivering a slate…