Sen. Dick Durbin (D-Ill.) said on Wednesday evening that a bipartisan immigration agreement has the support of a majority of the Senate. "The math is simple. We have 56 senators ready to move forward with this issue," he said. Four GOP senators signed onto the "Gang of Six" proposal. In addition to GOP Sens. Linsey Graham (S.C.), Cory Gardner (Colo.) and Jeff Flake (Ariz.) — who negotiated the deal — that brings the total number of Senate Republicans supporting the agreement to seven.