Senate Republican leaders have warned that the upper chamber might have to remain in session this weekend if it fails to pass a short-term spending bill by Friday.

According to lawmakers who attended a closed-door session Thursday afternoon, Majority Leader Mitch McConnell, R-Ky., told fellow Republicans not to leave town. Assuming the House can pass the bill and send it over, McConnell plans to call up a vote for the spending bill again and again in an effort to pressure reluctant lawmakers, mostly Democrats, to back the bill.