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 wide-ranging bill is the vehicle for much of Trump’s domestic policy agenda, containing key changes that will affect daily life for millions of Texans.

But almost all of the Republican holdouts on the megabill flipped and voted to advance the legislation early Thursday — setting up a final vote. During the all-nighter, GOP leaders kept the procedural vote open for almost six hours as they worked to flip 12 votes.