Republican senators on Tuesday said they were not surprised by President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE’s abrupt firing of Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE, with some acknowledging they’ve grown numb to the president’s unorthodox style of governing.

While senators didn’t receive advance notice of Tillerson’s firing, several said it had been clear for some time that he was on the outs with the president.

“People are getting used to this being what life is like under President Trump,” said a GOP senator, who requested anonymity to discuss private conversations with colleagues.

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The lawmaker said it would be better if there was more stability within the administration but there was little that could be done to change Trump’s management style.

“This has become the norm,” the source added, expressing regret over the departure of Tillerson and National Economic Council Director Gary Cohn. “Change has been in the air now for 14 months.”

Vice President Pence didn’t offer an explanation for why Trump fired his secretary of State when he spoke to senators at a lunch meeting Tuesday, according to lawmakers who attended.

He ignored a shouted question from a Fox News reporter about whether the White House is in “chaos” as he walked into the lunch meeting, where he touted the credentials of CIA Director Mike Pompeo Michael (Mike) Richard PompeoUS reimposes UN sanctions on Iran amid increasing tensions Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Trump steps up Iran fight in final election stretch MORE, whom Trump has nominated to replace Tillerson.

Lawmakers suspect that Trump wanted to have a new foreign policy team in place ahead of talks with North Korean leader Kim Jong Un.

“I knew they were talking about making the change, but I didn’t know it was coming this soon. I think a lot of it was driven by the North Korea negotiations, wanting to have the team he’s most comfortable with,” said Sen. Lindsey Graham Lindsey Olin GrahamMcConnell locks down key GOP votes in Supreme Court fight Will Republicans' rank hypocrisy hinder their rush to replace Ginsburg? Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-S.C.).

Many GOP senators are happy that Trump nominated Pompeo, a former House Republican lawmaker, to take the reins of the State Department. But several senators, including senior members of the Foreign Relations Committee, thought Tillerson was doing a good job and liked his process-oriented management style.

“I know him very, very well and talk with him often,” 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 of his relationship with Tillerson.

Corker said he didn’t receive any heads-up on Tillerson’s firing, which Trump announced on Twitter on Tuesday morning, but added that he wasn’t that surprised, given the clashing styles of the president and top diplomat.

“You’ve got a very entrepreneurial president and you’ve got a secretary of State who is more of a process person and puts things into place. It just hasn’t been a perfect relationship,” Corker added. “While I was unaware of it, and I spoke to both of them last week, I wasn’t surprised.”

The shakeup at the State Department and the CIA throws a wrench into the Senate schedule.

The Senate has one more week of work and then a two-week recess, which means Pompeo and Gina Haspel, Trump’s nominee to replace Pompeo as CIA director, are unlikely to be confirmed until the spring.

Haspel, the CIA’s deputy director, could face opposition from members of both parties because she ran a CIA “black site” prison during the George W. Bush administration.

Senate Armed Services Committee Chairman John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.) warned in a statement that Haspel would have to explain her record on the torture of suspected terrorists.

“Ms. Haspel needs to explain the nature and extent of her involvement in the CIA’s interrogation program during the confirmation process,” he said.

The GOP leadership expressed some frustration Tuesday that they would have to find more time on the schedule for a grinding confirmation fight when they’re trying to find floor time for a sex-trafficking bill, the omnibus spending package and other priorities.

“I’d rather be working on legislation,” said Senate Republican Conference Chairman John Thune John Randolph ThuneWhat Senate Republicans have said about election-year Supreme Court vacancies The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (S.D.).

The Senate confirmed Tillerson to head the State Department just over a year ago by a vote of 56-43. The chamber confirmed Pompeo as CIA director in January 2017.

Senate Republican Whip John Cornyn John CornynCalls grow for Biden to expand election map in final sprint Bipartisan praise pours in after Ginsburg's death Chamber of Commerce endorses McSally for reelection MORE (Texas) and Thune, the second- and third-ranking members of the Senate leadership, respectively, said they did not receive any advance warning from the White House about Tillerson’s ouster.

Only Sen. Tom Cotton Tom Bryant CottonBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Chris Wallace presses Cotton on 'any hypocrisy' between comments on Supreme Court vacancy in 2016 and today MORE (R-Ark.), who is close to Pompeo, said he had “indications” that there would be an imminent change at State. Previous reports about the White House moving Pompeo to State had floated Cotton as a possible replacement at the CIA.

Democrats on Tuesday criticized the high rate of turnover at senior administration officials as a sign of disorder and instability.

Other high-profile departures from the White House include Cohn, communications director Hope Hicks Hope Charlotte HicksSenate intel leaders said Trump associates may have presented misleading testimony during Russia probe: report Cuomo turned down Trump invitation to participate in April press briefing: report Trump shakes up White House communications team MORE, staff secretary Rob Porter, chief of staff Reince Priebus Reinhold (Reince) Richard PriebusLeaked audio shows Trump touted low Black voter turnout in 2016: report Meadows joins White House facing reelection challenges Trump names Mark Meadows as new chief of staff MORE, senior political adviser Stephen Bannon, presidential personal assistant John McEntee and communications aide Josh Raffel.

“What President Trump did and the way he did it once again indicates the chaos in this administration,” Senate Democratic Leader Charles Schumer Chuck SchumerRepublican senator says plans to confirm justice before election 'completely consistent with the precedent' Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year MORE (N.Y.) told reporters. “Their inability to have a center, the inability to have a consistent policy … it’s creating huge problems.”

Senate Democratic Whip Dick Durbin Richard (Dick) Joseph DurbinMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden Top GOP senator calls for Biden to release list of possible Supreme Court picks MORE (Ill.) added, “The departure of major players from this administration has been historic and worrisome.”

Durbin said he had “questions” about Haspel’s record on so-called enhanced interrogation techniques like waterboarding.

Sen. Bob Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (D-N.J.), a senior member of the Foreign Relations Committee, said he looks forward to “a full vetting of Director Pompeo.”

“They are a different set of skills. Being CIA director [requires] one set of skills. Being secretary of State requires diplomatic skills,” Menendez added.

Jordain Carney contributed.