President Trump is not ready yet to endorse a bipartisan deal to stabilize Obamacare's exchanges, according to the lead Republican sponsor of the package.

"He intends to review it carefully and see if he wants to add to it," said Sen. Lamar Alexander, R-Tenn., at an Axios event in Washington Wednesday.

Trump and Alexander spoke on Wednesday morning before the event and Alexander said Trump wants to be encouraging on the deal that emerged on Tuesday.

But Trump has not yet endorsed the deal. The level of support for the agreement that funds Obamacare insurer payments for two years could be critical to passage in a skeptical House.

Alexander said he believes the bipartisan deal reached with Sen. Patty Murray, D-Wash., will pass the Senate by the end of the year. He expects that the agreement could have some effect on rates for 2018, and that rates will go lower for 2019.