WASHINGTON (AP) — The White House is making America’s high-stakes fiscal crisis its top priority after President Barack Obama’s reelection, underscoring the vital importance of averting severe year-end tax increases and spending cuts as Obama heads toward a second term.

The newly reelected Obama is also weighing replacements for high-profile officials expected to leave his Cabinet and the White House soon. Treasury Secretary Timothy Geithner and Secretary of State Hillary Rodham Clinton both want to step down but have indicated a willingness to push their departures into next year, or at least until successors are confirmed. Defense Secretary Leon Panetta also wants to retire next year.

The president privately delved into both issues Thursday, his first full day back in Washington following his reelection on Tuesday. The president and his team were also assessing how congressional Republicans were positioning themselves following the election before saying much publicly about his second term.

In his victory speech Tuesday night, Obama offered a call for reconciliation after a divisive campaign. But he made clear he had an agenda in mind, citing a need for changes in the tax code, as well as immigration reform and climate change.

Obama aides want to avoid what they believe was an overreach by President George W. Bush, who declared after narrowly winning reelection that he had “political capital” and intended to spend it. One of Bush’s first moves was to push to privatize federal Social Security pensions, a plan that was roundly rejected by Congress and the public.

The White House believes Obama has a clear mandate on one key issue: raising taxes on families making more than $250,000 a year. Obama senior adviser David Plouffe said voters “clearly chose the president’s view of making sure the wealthiest Americans are asked to do a little bit more” to help shrink the federal deficit.

The president has long advocated allowing tax cuts first passed by Bush to expire for upper-income earners. But he gave in to Republican demands in 2010 and allowed the cuts to continue, angering many Democrats.

Both parties agree that the combination of tax increases and spending cuts set to hit on Jan. 1, the so-called fiscal cliff, could plunge the economy back into recession.

The White House wants consistency in its “fiscal cliff” negotiating team, meaning Geithner is likely to put off his departure from Treasury until Obama and lawmakers can reach some agreement.

White House chief of staff Jack Lew is seen as a leading candidate to replace Geithner. Lew is well-respected in Washington by both parties and served as budget director under both Obama and former President Bill Clinton.

Another person often mentioned as a possible successor to Geithner is Erskine Bowles, a White House chief of staff under Clinton and the co-chief of the White House’s 2010 deficit reduction commission.

Both Lew and Bowles would bring an intimate knowledge of the intricacies of the federal budget and could be expected to take a leading role in trying to negotiate a broad budget agreement with Congress. The selection of either would signal that the administration intends to make resolution of the government’s deficit problems a priority.

At the State Department, the leading candidates to take over as the top US diplomat are Democratic Sen. John Kerry and Susan Rice, the US ambassador to the United Nations.

But Rice has faced criticism from Republicans for providing initial accounts about the deaths of Americans in Benghazi, Libya, that later proved false. The White House has vigorously defended Rice, but the prospect of starting a second term with a contentious confirmation hearing may be unappealing.

Kerry, an early Obama backer, has long coveted the State Department job. He has traveled overseas on Obama’s behalf and even played the role of Romney during campaign debate preparations this year.

Other Cabinet secretaries who have talked about leaving are Attorney General Eric Holder and Transportation Secretary Ray LaHood, the only Republican in the Cabinet. Both have said they would speak with the president before making a final decision.

And if Obama taps Lew for the Treasury Department, he’ll have to add chief of staff to the list of vacancies.

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Copyright 2012 The Associated Press.