A political action committee tied to Senate Majority Leader John Thune (R-SD) has not stepped in with new spending for Sen. John Cornyn (R-TX) in the contentious Texas GOP Senate runoff, as polling shows the four-term incumbent slipping behind Texas Attorney General Ken Paxton.

One Nation PAC, which spent nearly $11 million backing Cornyn ahead of the March 3 primary, has not spent anything on the race in recent weeks. One Nation is the main advocacy arm for the Senate Leadership Fund, the Senate GOP’s official super PAC working to maintain Thune’s majority.