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 in a tweet on Sunday touted a campaign promise to pass tax reform as the House and Senate appear poised to this week pass an overhaul of the U.S. tax code.

"As a candidate, I promised we would pass a massive TAX CUT for the everyday working American families who are the backbone and the heartbeat of our country. Now, we are just days away...," the president tweeted.

As a candidate, I promised we would pass a massive TAX CUT for the everyday working American families who are the backbone and the heartbeat of our country. Now, we are just days away... pic.twitter.com/MADTGUMktX — Donald J. Trump (@realDonaldTrump) December 17, 2017

Trump originally made the comments in remarks at the White House last Wednesday.

The new tweet comes after Republican Sens. 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 (Fla.) and Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (Tenn.) announced they would support the legislation, effectively giving Senate 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.) the votes he needs for the legislation to pass the chamber.

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While there are no Republican senators publicly opposed to the bill, questions have swirled around the health of GOP 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 (Ariz.) and Thad Cochran William (Thad) Thad CochranEspy wins Mississippi Senate Democratic primary Bottom Line Mike Espy announces Mississippi Senate bid MORE (Miss.), and whether they will be well enough to vote on the measure.

Senate Majority Whip John Cornyn (R-Texas) said on Sunday that he expects the bill to pass through the Senate on Tuesday.

Trump has said he wants to sign a final version of the bill by Christmas.

The legislation, if passed, represents the first major legislative victory for Trump and Republicans, who have struggled to come through on major campaign promises such as repealing and replacing ObamaCare.