The final pieces of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s sweeping tax overhaul fell into place on Friday, giving Republicans a surge of momentum just days before they cast historic votes on the $1.5 trillion bill in the House and Senate.

Two high-profile Senate GOP holdouts — Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE of Tennessee and Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE of Florida — flipped from "no" to "yes" on the tax bill Friday afternoon, all but guaranteeing that Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) will have the 51 votes needed to pass the legislation in the upper chamber.

Heading into the weekend, GOP lawmakers and leadership aides were extremely bullish that the 503-page Tax Cuts and Jobs Act would pass the House on Tuesday, then narrowly clear the Senate either Tuesday evening or Wednesday.

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That would hand Trump and congressional Republicans their first major legislative victory since they took over full control of Washington last January. It also would fulfill Trump’s pledge to sign the tax-cuts bill into law by Christmas Day.

“This is happening. Tax reform under Republican control of Washington is happening." Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) said Friday afternoon during a conference call with rank-and-file House Republicans, according to a source on the call. “Most critics out there didn’t think it could happen. ... And now we’re on the doorstep of something truly historic.”

Rep. Mark Meadows Mark Randall MeadowsThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November House moves toward spending vote after bipartisan talks House Democrats mull delay on spending bill vote MORE (R-N.C.), chairman of the far-right Freedom Caucus, said it’s inevitable that GOP lawmakers won’t agree with every part of the tax bill. But by next week, he said, Republicans will come together to deliver a bill to Trump.

“I anticipate a number of members expressing concern over a variety of topics in the coming days, but there is a commitment to finish the work and put it on the president’s desk by Wednesday,” Meadows, who is close to Trump, told The Hill.

“I am extremely optimistic that we can overcome any remaining issues.”

House and Senate negotiators signed off on the final language of the bill Friday afternoon, meaning no more amendments or last-minute changes can be made.

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The final text made the child-tax credit refundable up to $1,400, up from $1,100. That tweak was enough to appease Rubio and Sens. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah) and Tim Scott Timothy (Tim) Eugene ScottAuthor Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' Now is the time to renew our focus on students and their futures GOP lobbyists pleasantly surprised by Republican convention MORE (R-S.C.). Earlier, Rubio had threatened to vote against the bill without more generous tax breaks for families with children.

“For far too long, Washington has ignored and left behind the American working class. Increasing the refundability of the Child Tax Credit from 55% to 70% is a solid step toward broader reforms which are both Pro-Growth and Pro-Worker,” Rubio tweeted Friday.

Corker, the retiring Senate Foreign Relations chairman who’s feuded on and off with Trump, objected to the bill over concerns it adds to the nation’s $20 trillion debt. But shortly after Rubio’s endorsement, Corker said he, too, was reversing course.

The tax bill is “far from perfect,” Corker said in a statement. “But after great thought and consideration, I believe that this once-in-a-generation opportunity to make U.S. businesses domestically more productive and internationally more competitive is one we should not miss. ...

“In the end, after 11 years in the Senate, I know every bill we consider is imperfect and the question becomes is our country better off with or without this piece of legislation. I think we are better off with it. I realize this is a bet on our country’s enterprising spirit, and that is a bet I am willing to make.”

With Rubio and Corker now on board, none of the 52 GOP senators are publicly opposed to the tax bill. Because of the narrow margin, it would take opposition from just three GOP senators to kill the tax overhaul.

Sens. Lee, Susan Collins Susan Margaret CollinsClub for Growth to spend million in ads for Trump Supreme Court nominee Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November MORE (R-Maine) and Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.) have not taken a position on the final bill, but each voted in favor of the tax bill that recently passed the Senate.

The two other wild cards are Sens. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (R-Ariz.) and Thad Cochran William (Thad) Thad CochranEspy wins Mississippi Senate Democratic primary Bottom Line Mike Espy announces Mississippi Senate bid MORE (R-Miss.). Both veteran senators back the tax bill but have missed votes all week due to health reasons. Cochran, the Appropriations chairman, is recovering from a procedure to remove a non-melanoma lesion on his nose.

Meanwhile, McCain, the Armed Services chairman who was diagnosed with brain cancer this summer, has been receiving treatment at Walter Reed Medical Center for side effects from his ongoing cancer therapy. A number of GOP lawmakers and aides on Friday expressed concern over McCain’s weakening health and said they were not certain he would be able to attend next week’s vote.

The health conditions of the two senior senators is so serious that GOP leaders tentatively have rearranged the vote schedule for the tax bill, Republican sources told The Hill.

The original plan was for the Senate to vote first. But on Friday, Ryan and Ways and Means Chairman Kevin Brady Kevin Patrick BradyBusinesses, states pass on Trump payroll tax deferral Trump order on drug prices faces long road to finish line On The Money: US deficit hits trillion amid pandemic | McConnell: Chance for relief deal 'doesn't look that good' | House employees won't have payroll taxes deferred MORE (R-Texas) announced on the conference call that the House would go first, participants said. By having the House vote first, Senate Republicans could simply hold an up-or-down vote on the House-passed bill, sources said.

But if the Senate went first, Democrats would have the ability to demand a series of procedural votes on “motions to instruct” — a drawn-out process that would be physically taxing on the ailing McCain and Cochran.

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Having the House vote first “speeds up the process over there,” a senior House GOP lawmaker explained.

For insurance, Vice President Pence, who also serves as the president of the Senate, has delayed his trip to the Middle East in the event Republicans need him to cast a tie-breaking vote, as he’s done several times this year.

According to highlights unveiled Friday evening, the final tax bill would lower individual rates and set rates at 10 percent, 12 percent, 22 percent, 24 percent, 32 percent, 35 percent and 37 percent. It also repeals ObamaCare’s individual mandate requiring Americans to have health insurance. And it expands the use of 529 accounts, allowing families to save for elementary, secondary and higher education.

“At the end of day, everybody is coming to the table in good faith to get to yes,” said moderate Rep. Tom Reed Thomas (Tom) W. ReedCentrist House group offers bipartisan COVID-19 relief deal House approves two child care bills aimed at pandemic Diabetes Caucus co-chairs say telehealth expansion to continue beyond pandemic MORE (R-N.Y.), a member of the tax-writing Ways and Means Committee and co-chairman of the bipartisan Problem Solvers Caucus.