The Senate always moves pretty slowly, but things ground to a complete halt Tuesday night so that senators can attend a wedding engagement party for Sen. Susan Collins (R-Maine).

Sen. Susan Collins (R-Maine) and her fiancee, Thomas Daffron, photographed in Aroostook County, Maine. (AP)

Noting that “members of the Senate family” wished to attend the party, Senate Majority Leader Harry M. Reid (D-Nev.) said he had consulted with Senate Minority Leader Mitch McConnell (R-Ky.) and the pair agreed senators would resume consideration of the bill Wednesday.

“I feel very good that we’re going to pass our bill,” Sen. Barbara Boxer (D-Calif.), lead sponsor of the highway measure, said as the day’s proceedings ended.

Collins, 59, announced her engagement in January to management consultant Thomas A. Daffron, 73. Her office confirmed that she is holding an engagement party Tuesday evening, but declined to offer further details.

As The Post’s Reliable Source reported at the time, the pair became friends in the late 1970s as staffers for then-Sen. Bill Cohen, but only started dating a few years ago. He’s the chief operating officer of D.C.-based Jefferson Consulting Group who also advised her during her three Senate races. She told the Bangor Daily News they share a love of swimming, kayaking and reading. First wedding for the Maine Republican. They’re planning a small summer ceremony in her home state.

Follow Ed O’Keefe on Twitter: @edatpost

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