WASHINGTON — The Republican tax rewrite unveiled on Thursday has set off a scramble among lobbyists and interest groups desperate to preserve prized tax breaks that are suddenly at risk in the sweeping bill moving through the House.

Yet the ability of K Street to prevent longstanding tax provisions from getting the ax is running headfirst into Republicans’ own mad dash as they attempt to quickly pass the tax rewrite and get it to President Trump’s desk by Christmas.

The rapid pace set out by Republican leaders is by design: They want to prevent the kind of arm-twisting that has long bedeviled previous tax overhaul efforts by leaving little time for outside groups to blitz lawmakers with concerns. Several consultants and lobbyists said on Friday that individual companies were just beginning to digest how the 400-plus page bill, which drastically changes how American businesses are taxed at home and abroad, would affect their bottom lines.

Another complication was presented by President Trump, who wants to include a controversial measure to do away with the Affordable Care Act’s mandate that most Americans have health coverage or pay a penalty. On Friday, the House’s leading tax writer opened the door to including that provision, saying that no decision had been made.