The revised package now heads back to the House, where Republican leaders hope to approve it and send it to Trump before a self-imposed July 4 deadline. But it faces hurdles.

This time, Senate Republicans were dead-set on making an expensive suite of pro-growth business tax cuts permanent. That required finding deep offsetting cuts, and the cold, hard calculus by the Senate GOP’s chief architects was that enough of their 53-member conference would ultimately swallow their protests and go along.