A group of White House officials is heading to Capitol Hill Wednesday night for a briefing on the Senate Republicans' healthcare reform plan.

Senate leadership staffers plan to walk President Trump's representatives through the proposal, according to a White House official.

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The meeting comes a day before Senate GOP leaders are set to unveil the plan, which was crafted behind closed doors.

The conversation could also touch on what role, if any, senators want Trump to play in selling the bill or whipping votes.

Thus far, senators have held the measure very close to the vest. White House press secretary Sean Spicer on Tuesday couldn't say whether Trump or his staff had seen the proposal.

But on Wednesday, Trump spokeswoman Lindsay Walters said that "the appropriate individuals have seen the bill."

"The president’s legislative team has been working with the Senate leadership team as well as members on the Senate side. And the president has received a full brief from his legislative team," she told reporters aboard Air Force One.