WASHINGTON—The House narrowly passed Republicans’ sprawling tax-and-spending bill, delivering a major second-term victory for President Trump and again demonstrating his power to keep GOP lawmakers in line.

President Trump is scheduled to sign the bill into law at 4 p.m. on July 4 at the White House, locking in tax reductions and Medicaid cuts.

Opponents of the most regressive legislative proposal in a generation only needed four House Republicans to balk. That didn't happen.