Republicans are on the brink of a massive achievement as they edge closer to finishing the first year of a GOP Congress under 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.

Votes in the House and Senate are anticipated early this week on a sweeping tax-cut package that will dramatically alter filings for corporations, businesses and families throughout the country.

It will deliver a real victory to the White House after a year in which it has seen its legislative agenda falter on Capitol Hill.

Trump on Sunday was clearly looking forward to the week.

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“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,” he tweeted.

It will also represent a big win for 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.), a political figure closely tied to tax reform who seems poised to achieve landmark legislation as speculation swirls around his future.

Republicans on Sunday were practically salivating over what is to come.

“We are on the 1-yard line and we intend to punch it in in a good, strong way on Tuesday,” Rep. 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), the chairman of the House Ways and Means Committee, said on Fox News’s “Sunday Morning Futures with Maria Bartiromo.”

“And this means Americans on April 15, that will be the last time Americans have to file under this horrible broken tax code, so there is a lot to be happy about.”

In the Senate, any drama over the outcome appeared to be extinguished with the news that Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.), a "no" on the Senate tax-cut bill, would back the House–Senate compromise bill. Sen. 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 (R-Fla), who for a day was a “no” vote, also said he’d back the bill after a tax credit aimed at low- and middle-income families was enhanced.

There are still uncertainties, including the possibility that Sen. 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.) could miss the vote. McCain's office on Sunday confirmed that the senator, who was diagnosed with brain cancer earlier this year, will be in Arizona for medical treatment and that he won't return to Washington until January. Sen. Thad Cochran William (Thad) Thad CochranEspy wins Mississippi Senate Democratic primary Bottom Line Mike Espy announces Mississippi Senate bid MORE (Miss.) is also dealing with health issues.

Still, even if both missed the vote, Republicans are likely to have 50 of their members in line, which would allow Vice President Pence to break a tie.

With all Democrats voting against the bill, only a surprise would keep it from passing.

Whether the bill is really a political winner for the GOP is another question. Polls consistently show a majority of Americans are opposed to the tax bill. While Republicans believe those numbers will turn around, Democrats are likely to use the bill against GOP candidates in next year's midterm elections, arguing its benefits fall mostly on corporations and the rich rather than the middle class.

The tax bill isn’t the only big item Republicans need to finalize before heading back to their districts for the holidays.

Lawmakers must also pass a stopgap measure to again avert a government shutdown that would begin Saturday.

The House is expected to move first, with Republicans poised to pass what they are describing as a “cromnibus” bill. It would pair full year of defense funding — a defense omnibus — with a continuing resolution that would fund the rest of the government into January.

Pairing those measures meets the demands of House Republicans who want to fund the Pentagon through the year, but it will run into a Democratic wall in the Senate, where the minority party will not back legislation that would fund the Pentagon for the year but the rest of the government for just a matter of weeks.

Senate Minority Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (D-N.Y.) warned that House Republicans are burning up hours of limited time by moving forward with a bill that can’t get 60 votes.



“House Republicans should have known not to waste everyone's time with a partisan spending bill that could never pass the Senate,” he said, noting that 44 of his 48 members have pledged to oppose it.



Democrats argue the legislative posturing takes away from ongoing bipartisan negotiations aimed at reaching a separate agreement on ceilings for defense and nondefense spending for the next year.

After Congress passed an earlier stopgap measure to prevent a shutdown earlier in December, the idea was that lawmakers would agree to the ceilings and then approve a new stopgap to buy time to negotiate details.

Congress does face another deadline. Without a permanent spending bill by mid-January, automatic spending cuts known as sequestration will become law and cut into the defense and nondefense budgets. Lawmakers in both parties want to avoid that.

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.) hasn’t outlined what he will offer in response to the House legislation. But the Senate is expected to pass a short-term continuing resolution that would fund the government into early next year.



“I don’t think there’s any way the Senate can pass that bill,” said Sen. Roy Blunt Roy Dean BluntSocial media platforms put muscle into National Voter Registration Day Senate GOP faces pivotal moment on pick for Supreme Court This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda MORE (R-Mo.), referring to the House’s continuing resolution.

He predicted that the Senate will send a “plain vanilla” bill back to the House.

Further complicating their bid to fund the government, lawmakers are mulling trying to tackle leftover deadlines by dropping fights over health care, disaster aid and an extension of a controversial surveillance program into the funding bill.



But the moves would likely spark divisions between House and Senate Republicans and would frustrate conservatives and privacy hawks.



Senate leadership has promised Sen. 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) that they would include ObamaCare’s cost-sharing reduction payments and “reinsurance” programs in a must-pass bill by the end of the year in a bid to win over her support for the tax bill.



Collins appears confident that the two provisions will ultimately get passed and told reporters that the short-term continuing resolution is the “likely vehicle.”



Cornyn also signaled that Senate leadership is prepared to jam a short-term extension of the National Security Agency’s warrantless surveillance program, known as Section 702, into the government-funding bill.



Neither the surveillance program nor the additional health-care funding is in the House’s government funding bill.



And any changes made to the government funding bill in the Senate will force the legislation to be sent back to the House, where GOP leadership will need to win over privacy hawks and conservatives or lean on Democrats for support.



Meanwhile, Democrats are continuing to demand a fix for the Deferred Action for Childhood Arrivals program by the end of the year and believe the funding fight gives them leverage.



Asked about punting the immigration fight to January, Sen. Dick Durbin Richard (Dick) Joseph DurbinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Grand jury charges no officers in Breonna Taylor death Democrats shoot down talk of expanding Supreme Court MORE (D-Ill.) reiterated that his party wants an agreement this year.



“They all feel as I do. It's a necessary to do it, and they want it done this year,” he said. “And that's our goal so we'll keep working at it."