Ukrainian President Volodymyr Zelenskyy, center, is escorted by Senate Minority Leader Mitch McConnell, R-Ky., left, and Senate Majority Leader Chuck Schumer, D-N.Y., to his meeting on military aid with U.S. Senators in the U.S. Capitol on Tuesday, December 12, 2023.

Senators on Sunday raced to release a highly-anticipated bill that pairs border enforcement policy with wartime aid for Ukraine, Israel and other U.S. allies as part of a long-shot effort to push the package through heavy skepticism from Republicans, including House Speaker Mike Johnson.

The proposal is the best chance for President Joe Biden to resupply Ukraine with wartime aid — a major foreign policy goal that is shared with both the Senate's top Democrat, Sen. Chuck Schumer, and top Republican, Sen. Mitch McConnell. The Senate was expected this week to hold a key test vote on the legislation, but it has already run into a wall of opposition from conservatives.