Two House Republican committee chairmen, Reps. Bill Shuster (Pa.) and Jeff Miller (Fla.), announced their support for Trump on Thursday. And sources said more rank-and-file Republicans are expected to follow suit, including longtime Rep. John Duncan Jr. (Tenn.).

Furthermore, regular meetings between House lawmakers and top Trump aides, once sparsely attend, have suddenly become must-see events.

Trump’s convention manager, Paul Manafort, huddled with House Republicans on Thursday in a meeting described by one attendee as “standing room only.”

Among the Republicans in attendance were Pennsylvania Reps. Tim Murphy and Mike Kelly. Neither have endorsed Trump though Kelly said he voted for him in Tuesday’s presidential primary.

Trump supporter Rep. Tom Reed (R-N.Y.) noted the jump in attendance after attending Thursday’s meeting at the Capitol Hill Club next to the Republican party headquarters.