Trump admin updates: Trump says tariff letters to be sent to 'various countries' on Monday

Dr. Mehmet Oz, the administrator of the Centers for Medicare and Medicaid Services, was at the White House Wednesday during President Trump and Vice President Vance’s meeting with House Republicans, a source familiar with the matter told ABC News.

This meeting was with the "main street" Republicans concerned about the bill’s cuts to Medicaid, the source added.

Dr. Oz also had a call earlier this week with House Republicans who expressed concerns about funding cuts to hospitals, according to this source and another source familiar with the call. During that call, Dr. Oz mentioned that the Republicans should look into the finances of those hospitals, the sources said.

The Department of Health and Human Services did not immediately respond to a request for comment.

-ABC News' Selina Wang

House Speaker Mike Johnson delivered "a progress report" to reporters on Wednesday afternoon -- stopping outside the chamber as he arrived for the rule vote as it remains unclear whether Republicans have the votes to keep the legislation on track for final passage.

"We are working through everybody's issues and making sure that we can secure this vote. I feel very positive about the progress," Johnson said after meeting with various factions within the House Republican Conference. "We've had lots of great conversations."

Johnson said that he and a "fully engaged" Trump have met with individuals and groups all day long "trying to convince everybody this very best product that we produce."

While Johnson said he feels "good" about the state of play, he hinted ominously, "there’s more conversation to be done."

-ABC News' John Parkinson

The vote series is underway. The vote to adopt the rule to advance the Trump mega bill is the third vote in the series.

-ABC News' Lauren Peller

Rep. Andy Harris, chair of the ultra-conservative House Freedom Caucus, reiterated his threat that hardline Republicans will tank a key procedural vote on Trump's mega bill and stop the legislation’s progress dead in its tracks.

The vote is expected within the hour, but could slide later.

Some Freedom Caucus members have been shuttling from the Capitol to the White House today to meet with the president and administration officials on the bill. Harris’ members are particularly incensed the Senate version of the bill is estimated to increase the national debt by $1 trillion more than the House version.

"It can't get passed by Friday unless the Senate's in town," Harris told ABC News.

"The rule vote will fail if he brings it to the floor, and at some point he's going to have to decide whether it pays to try to make changes, get it back over the Senate. Right now, what the president should be doing is calling the Senate back into town," he added.

-ABC News' Jay O'Brien