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

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

The House is wrapping up the rule debate after dozens of Democrats tried to delay moving forward on the GOP spending bill.

The vote series will start soon, and the third vote of the series is on adopting the rule to provide floor consideration for the Trump megabill.

-ABC News' Lauren Peller