President Trump will meet with Senate Republicans on Capitol Hill for the first time since taking over the White House.

The meeting, which will take place Tuesday during the caucus’s weekly policy lunch, is slated to focus on an increasingly crowded end-of-the-year agenda and rally Republicans to unify as they enter a make-or-break stretch on tax reform.

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But the caucus powwow could also test Trump’s ability to stay on message as he comes face to face with some of his most vocal GOP critics, including Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.) who sparred with then-candidate Trump during last year’s caucus meeting.

Here are five things to watch:

Does GOP iron out any details on tax reform?

The focus of the closed-door meeting is expected to be on Republicans’ biggest goal for the remainder of 2017: passing a tax plan.

Despite having the first unified GOP government in roughly a decade, Republicans have struggled to score major legislative wins and failed on their first big agenda item: repealing and replacing ObamaCare.

Republicans have pivoted to tax reform, which they say is must-pass legislation this year. But there are already signs of dissension between both sides of Pennsylvania Avenue.

House Republicans hadn’t made a final decision, but they were said to be considering reducing the amount of money Americans could put into their retirement savings accounts each year. Trump weighed in on Twitter on Monday, saying no changes would be applied to an individual’s 401(k).

“There will be NO change to your 401(k). This has always been a great and popular middle class tax break that works, and it stays!” Trump said in a tweet.

Does Trump weigh in on latest health care push?

Pressure will be on Trump to clearly stake out where he is on a bipartisan bill by Sens. Lamar Alexander Andrew (Lamar) Lamar AlexanderGraham: GOP will confirm Trump's Supreme Court nominee before the election The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda MORE (R-Tenn.) and Patty Murray Patricia (Patty) Lynn MurrayTrump health officials grilled over reports of politics in COVID-19 response CDC director pushes back on Caputo claim of 'resistance unit' at agency The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Wash.), the top members of the Senate Health Committee.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellGraham: GOP will confirm Trump's Supreme Court nominee before the election Trump puts Supreme Court fight at center of Ohio rally The Memo: Dems face balancing act on SCOTUS fight MORE (R-Ky.) said Sunday he would bring up legislation aimed at stabilizing the individual insurance market if it has Trump’s support.

“I’m not certain yet what the president is looking for here, but I’ll be happy to bring a bill to the floor if I know President Trump would sign it,” McConnell told CNN’s “State of the Union.”

Trump has sent mixed signals on the Alexander-Murray proposal that would extend ObamaCare’s cost-sharing reduction payments after the administration announced it was ending them. He appeared to take credit for the bipartisan talks, and privately encouraged Alexander, before appearing cool to the details of the deal.

The reversal confused GOP senators who publicly urged Trump to clarify what more he wants in the agreement.

"The next step is for the White House to say what it would like to see added," Alexander told reporters on Monday. "The White House has the ball right now."

Alexander told reporters that he called and thanked McConnell for his comments but expects Trump to focus on tax reform.

"I doubt if I'll hear anything [Tuesday]," he told reporters Monday evening.

In addition to health care, Congress is facing a slew of end-of-the-year deadlines, including getting a government funding deal by Dec. 8.

Asked what the message to senators on Tuesday will be, Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE, Trump's budget director, also pointed to wanting the Senate to have a longer workweek including Friday sessions and the “occasional weekend” vote.

Trump has had 175 nominees confirmed as of Oct. 19, according to a tracker by The Washington Post and the Partnership for Public Service, compared with 359 by the same point for President Obama and 375 by the same point for President George W. Bush.

Do senators bring up Stephen Bannon’s primary threats?

Trump could face questions about Stephen Bannon, his former chief strategist, as the Breitbart News chairman is taking aim at GOP incumbents.

Republicans face a favorable map in 2018, where Democrats are defending 25 seats including 10 in states won by Trump.

However, there’s growing concern that a slate of nasty primary fights could drain party resources and put otherwise safe seats in play if antiestablishment Republicans win the primary but struggle in the general election.

GOP senators, including McConnell, are downplaying Bannon’s impact.

“Well, you know, this element has been out there for a while. They cost us five Senate seats in 2010 and 2012 by nominating people who couldn't win in November,” McConnell told CNN on Sunday.

But Trump, asked about Bannon’s efforts during a recent press conference, didn’t directly tell his former strategist not to challenge incumbent senators.

“I like Steve a lot. Steve is doing what Steve thinks is the right thing. Some of the people that he may be looking at, I'm going to see if we talk him out of that, because, frankly, they're great people,” Trump said.

Bannon has said he wants to challenge every GOP incumbent up reelection next year, except Sen. Ted Cruz Rafael (Ted) Edward CruzThe Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy Murkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight MORE (Texas).

Does Trump lash out at GOP senators?

Trump’s previous attempt at winning over a skeptical Senate GOP caucus heading into the party’s 2016 convention ended up in fireworks.

The meeting, which was arranged to try to get Republicans and the then-candidate on the same page, went off the rails when the president got into a verbal spat with GOP Sen. Jeff Flake (Ariz.) and criticized GOP Sen. Ben Sasse Benjamin (Ben) Eric SasseChamber of Commerce endorses McSally for reelection Ben Sasse is mistaken with idea for the election of senators in America Big Ten football to return in October MORE (Neb.) and former Sen. Mark Kirk Mark Steven KirkLiberal veterans group urges Biden to name Duckworth VP On the Trail: Senate GOP hopefuls tie themselves to Trump Biden campaign releases video to explain 'what really happened in Ukraine' MORE (R-Ill.).

Republicans are hoping to avoid a repeat of the fight, meaning Trump will need to stay on message. But he’ll have plenty of opportunities to lash out at his largest critics.

A spokesman for Flake confirmed the Arizona Republican, who is up for reelection in 2018, will attend the lunch.

Trump previously pledged to defeat Flake during the 2016 meeting. He praised former state Sen. Kelli Ward, his primary challenger, on Twitter and called Flake “toxic” and “WEAK on borders, crime and a non-factor in Senate.”

Trump will also see 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.), whose office confirmed he will attend, and Sen. John McCain John Sidney McCainBiden's six best bets in 2016 Trump states Replacing Justice Ginsburg could depend on Arizona's next senator The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Ariz.).

Corker, who is retiring after 2018, has lobbed volleys at Trump including comparing the White House to an “adult day care center” and warning that Trump could lead the country into World War III. Trump has mocked Corker on Twitter.

Meanwhile, McCain, who has traded sporadic insults with the president for years, laughed when asked on Monday during an interview on ABC’s “The View” if he is “scared” of Trump. McCain confirmed Monday evening that he would attend the lunch.

Will anyone skip the meeting?

When then-candidate Trump came to Washington last summer for his first meeting with the Senate GOP caucus, several senators up for reelection in blue and purple states didn't attend.

Now most, if not all, of the 52-member caucus is expected to be at the meeting.

Sen. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.), who has skipped previous White House meetings, said Monday he would attend the lunch.

"I'm going to be in a body of colleagues, I don't think it's improper," Burr told reporters.

Burr, chairman of the Senate Intelligence Committee, told reporters earlier this year that he would avoid going to the White House because of his panel’s ongoing investigation into Russian interference in the 2016 election.