Republicans on Capitol Hill and party strategists are surprised and a bit annoyed by the timing of Nikki Haley Nimrata (Nikki) Haley'The soul' versus 'law and order' Author Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' GOP lobbyists pleasantly surprised by Republican convention MORE’s decision to resign from the Trump administration.

Publicly, Republican lawmakers are effusively praising Haley, the U.S. ambassador to the United Nations, who is a star among the party’s conservative base. But privately they’re scratching their heads about the timing of the announcement, which stole attention from Justice Brett Kavanaugh Brett Michael KavanaughHarris faces pivotal moment with Supreme Court battle Poll: 59 percent think president elected in November should name next Supreme Court justice Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight MORE’s first day on the Supreme Court.

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One of the most puzzling elements of Haley’s departure is that it was announced less than a month before the midterm elections even though she’s not stepping down until the end of the year. That has sparked speculation on why she went public on Tuesday instead of waiting another month or so.

“The timing here, I think, would strike most political observers as unusual. It’s not the normal kind of thing to announce a resignation like this a month before the midterm congressional elections,” Rep. Mark Sanford Mark SanfordOn The Money: Business world braces for blue sweep | Federal Reserve chief to outline plans for inflation, economy | Meadows 'not optimistic' about stalemate on coronavirus deal Trump critic Sanford forms anti-debt advocacy group Republicans officially renominate Trump for president MORE (R-S.C.) told CNN on Tuesday afternoon.

Democrats seized on it as evidence of a White House in disarray, one of the themes of their midterm campaign message.

“It came as a surprise,” said Senate Democratic Whip 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 (Ill.), who said he couldn’t remember such a high-ranking official leaving an administration so close to an election.

“This is such a pattern of change,” he said. “It’s a very challenging, to say the least, if not frustrating assignment to work for this president.”

Haley in her resignation letter, dated Oct. 3, said she wanted to return to the private sector after serving 14 consecutive years in public office.

“As a businessman, I expect you will appreciate my sense that returning from government to the private sector is not a step down but a step up,” she wrote to Trump, informing him that she would serve until January 2019.

“There is something odd about it. It is odd so close to an election to do this, especially since she’s going to the beginning of the year,” said a Senate GOP aide.

GOP staffers and strategists said the announcement caught GOP lawmakers off guard on a day when they were planning to tout Kavanaugh’s first day on the Supreme Court and Friday’s jobs report, which showed the unemployment rate dropping to a nearly 50-year low, 3.7 percent.

“Odd,” said a second Republican aide. “My first reaction was, why couldn’t she wait until Nov. 7? She’s hanging on until the end of the year so there’s no reason to do it now.”

A Republican strategist said Haley’s departure has spurred chatter about her motives and the internal political dynamics of the White House at a time when Republican candidates are trying to keep voters focused on the economy.

“In addition to triggering an avalanche of speculative rumors about what she may or may not have in mind down the road and whether there’s more movement to come in the administration, it also served as another distraction from the good things that are happening for Republicans,” the strategist said.

“Every House member locked in a difficult race desperately needs to have a conversation about the booming economy and anything distracting from that topic hurts their chances to win,” the strategist added.

GOP lawmakers on Tuesday expressed some disappointment over Haley’s departure and said they are looking forward to seeing what she does next.

“I liked Nikki Haley. I think she did a good job at the U.N.,” said Senate Republican Whip John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court MORE (Texas). “I’m looking forward to her next act, whatever that may be.”

Lawmakers view Haley, who was confirmed by the Senate 96-4, as one of the most steady figures in the administration and see her playing other leadership roles in the future.

Senate Foreign Relations Committee Chairman Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) said he has confidence that Secretary of State Mike Pompeo Michael (Mike) Richard PompeoTreasury sanctions individuals, groups tied to Russian malign influence activities Navalny released from hospital after suspected poisoning Overnight 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 MORE will keep international diplomacy running smoothly.

Corker said he got the sense during a visit with her three months ago that she only planned to stay a couple years in the U.N. job.

Some say that Haley may be positioning herself to be appointed to the Senate in case Trump taps Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) to replace Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE. Haley previously served as South Carolina’s governor.

Graham, however, said Monday that he has no intention of working for Trump.

“I have zero interest in serving in 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 Cabinet,” Graham told reporters in South Carolina. “I like him, I want to help him, I want him to be successful. I think I can do more good for the country and help President Trump more effectively by being in the Senate.”

But that claim isn’t likely to persuade GOP colleagues who view Graham’s recent efforts to ingratiate himself with Trump as a not-so-veiled audition for a high-level post in the administration.

Graham told Fox News’s Chris Wallace that a second term for Trump is “looking better and better” shortly before playing golf with him Sunday. And he made a splash earlier this month by delivering a fiery denunciation of Democratic tactics when Kavanaugh testified before the Judiciary Committee, the type of hardball politics that Trump loves.

Others maintain that Graham enjoys the spotlight of the Senate and he is positioning to get Trump’s endorsement in his 2020 Senate campaign — both in the primary and general election.

Yet another theory on Haley is that she may be leaving because of a possible controversy over accepting flights on private planes, an issue that derailed former Secretary of Health and Human Services Tom Price Thomas (Tom) Edmunds PriceConspicuous by their absence from the Republican Convention Coronavirus Report: The Hill's Steve Clemons interviews Chris Christie Trump flails as audience dwindles and ratings plummet MORE.

A government watchdog group, Citizens for Responsibility and Ethics in Washington (CREW), sent a letter to the State Department’s inspector general Monday asking for an investigation into whether Haley complied with executive branch gift rules after accepting flights on private planes.

Haley’s resignation letter, however, was dated several days before CREW filed its complaint.

Even though the media’s focus turned from Kavanaugh to Haley on Tuesday, some Republicans say there is no comparison between the two news events.

“Kavanaugh ignited a much bigger debate and energy in our base than Nikki Haley’s resignation,” said 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.), co-chairman of the bipartisan Problem Solvers Caucus. “Ambassador Haley will continue to play a long-term role in our success. She is a leading voice communicating why we fight for what we believe in, and I am confident her voice will be loud and clear throughout this cycle and beyond.”

A House Republican campaign official also waved it off: “My honest take is that it doesn’t impact that much, and I don’t have any reason to think she timed it specifically for before the election.”

Melanie Zanona, Scott Wong and Juliegrace Brufke contributed.