Senators will again gather at the Capitol on Sunday in an attempt to negotiate an end to the now 40-day government shutdown, after a rare Saturday session yielded little progress despite mounting

Republican Senate Majority Leader John Thune said Monday that he was “optimistic” the Senate could vote to reopen the government by the end of the week if lawmakers make progress over the next couple days.

The government shutdown has reached Day 31, and by Monday it'll tie the longest funding lapse in history. Will Senate vote today? Here's the latest.