Why didnt McConnell invite Sen.Judd Gregg the highest-ranking Republican on the Budget Committee is he worried?

Sen. Judd Gregg (N.H.), the highest-ranking Republican on the Budget Committee, wasn’t on a list distributed Tuesday by Minority Leader Mitch McConnell’s (R-Ky.) office. The White House had already invited senior members of both parties, but allowed both McConnell and Majority Leader Harry Reid (D-Nev.) to tap four more members of their choosing.