The Senate will vote at 12 p.m. Monday on a bill to reopen the government and fund it for three weeks.
The vote comes three days after the government officially shut down Friday at midnight.
The vote was moved from 1 a.m. ET Monday to noon after it became clear Democrats would block the spending bill over disagreements on a variety of issues, most notably what do about young people affected by the Deferred Action for Childhood Arrivals (DACA) program.
Senate rules impose a threshold of 60 votes to break a filibuster.
Senate Republicans currently hold a majority of 51 votes, meaning even if they can unite their members, they need nine more votes to end debate.
It remains unclear if this plan will win over enough Democrats to pass.