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.

The Republican package would slash taxes, boost spending on immigration enforcement and the military, and impose steep cuts to Medicaid, SNAP and clean energy funding.

The House on Thursday passed the signature piece of legislation of President Trump's second term, approving his "big, beautiful bill" by a vote of 218 to 214.