President Trump and Gov. Ricardo Rosselló of Puerto Rico participate in a meeting in the Oval Office of the White House on Oct. 19. (Jabin Botsford/The Washington Post)

President Trump on Sunday afternoon plans to join a conference call of House Republicans to rally support for a Senate-passed budget bill that clears the way to enact tax cuts later this year without Democratic support.

White House and congressional aides who confirmed plans for the call described Trump’s involvement as an attempt to build momentum for passing a tax bill by the end of the year.

That would be a marquee accomplishment for Republicans in a period where they have struggled to achieve major legislative accomplishments, despite controlling the White House and both chambers of Congress.

Trump will ask the House GOP to accept the Senate budget plan rather than negotiating with the other chamber over differences in their fiscal blueprint, aides said.

Such a move “may save as many as 10 or 12 legislative days,” Mick Mulvaney, director of the Office of Management Budget, said during an appearance on “Fox News Sunday.” He called that prospect a “big deal” as the party seeks to coalesce around a tax plan by year end.

The writing and selling of a bill still poses significant challenges in the coming weeks, however.