Momentum has shifted in the battle over immigration reform, putting Senate Democrats in a position to pass a bipartisan bill with well over 60 votes.

Republican lawmakers predicted Thursday that as many as 15 Republicans could vote for comprehensive immigration reform legislation, putting the bill’s sponsors in striking distance of their 70-vote goal.

The bill’s sponsors scored a victory Thursday when they announced a deal with Republican Sens. Bob Corker (Tenn.) and John Hoeven (N.D.) to double the number of border patrol agents to 40,000. The compromise also mandates the construction of 700 miles of fencing along the U.S.-Mexico border and mandates an increased deployment of surveillance technology.