House Democrats Take On Trump Through High-Stakes Litigation

Deadlock since midterms has led to more legal face-offs between executive and legislative branches

The Democratic-controlled House of Representatives is playing an unusually active role in federal courtrooms, where the fate of key Trump administration policies as well as the powers of Congress to investigate the president are at stake.

Douglas Letter, general counsel of the House, over the past two weeks has argued—and won—two cases involving congressional subpoenas seeking Trump financial records. That includes one Wednesday in which a New York federal judge announced his decision against the president...