Business was brisk on Friday, with a collection of more than two dozen Marines and their families assembled in the lobby, as well as business executives in town to make pitches to the federal government, and an assortment of other fans of President Trump.

Spending at the hotel by political groups has continued uninterrupted during the impeachment proceedings, including by the Republican National Committee, which has paid more than $440,000 to the hotel since Mr. Trump was elected. America First Action, a super PAC that supports Mr. Trump’s causes, has spent another $505,000 at the hotel since 2017.

“NEVER SETTLE,” read the screen on the cash register, the slogan of the Trump Hotels brand, and in a way a motto for Mr. Trump himself throughout the impeachment saga.

The hotel was the regular gathering place for many of the key players in the tale.

Lev Parnas, who pressured officials in Ukraine to investigate the Biden family, called it “our BLT office on the second floor,” referring to the BLT Prime steakhouse on the mezzanine overlooking the hotel lobby, which Mr. Trump frequents for dinner.

“It was like a breeding ground at the Trump hotel,” Mr. Parnas told Rachel Maddow recently.

Rudolph W. Giuliani, Mr. Trump’s personal lawyer and the architect of the pressure campaign, dines so frequently at BLT Prime that he has a regular table with a nameplate reading, “Rudolph W. Giuliani, Private Office.” He was there Thursday night, chatting with a lobbyist for the medical marijuana industry.