A marathon voting session on President Donald Trump’s sweeping domestic policy bill is underway in the Senate and has stretched overnight into Tuesday after a weekend of negotiations and delays.

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.

Lawmakers voted largely along party lines to advance the megabill, overcoming weeks of closed-door negotiations and internal disagreements.