ABC News' Sunlen Miller reports:
President Obama will formally announce the long-awaited and anticipated decision that Rahm Emanuel will resign as White House Chief of Staff to run for mayor of Chicago.
During a late-morning announcement, the president also will announce that Pete Rouse will step in as chief of staff, serving for now on an interim basis.
On Wednesday White House press secretary Robert Gibbs' spoke at length about Mr. Emanuel's tenure at the White House, falling just short of two years.
"The title chief of staff in many ways says it all. He has been the energetic, inspirational leader of us, taking the president’s promises and agenda and enacting them into law,” Gibbs said.
Gibbs also lavished praise upon Rouse and played up his loyalty and trust with the president.
“Pete has been with Sen.-elect, Sen., President-elect, and now President Obama," he said. "There is a complete loyalty and trust with somebody like Pete. Pete's strategic sense has played a big part in the direction of virtually every big decision that's made inside of this White House. So I think the type of trust that the president and others throughout this administration have in Pete is enormous.”
Later in the morning, the president will meet privately with Secretary of State Hillary Clinton in the Oval Office.
Afterwards, the president will make a quick trip to the Supreme Court where he will attend Justice Elena Kagan’s investiture ceremony. Kagan took the oath at a private ceremony in August so that she could hire clerks and begin work, but today's ceremony will be invitation-only in the majestic court room.
After the ceremony, she will take the symbolic walk down the court's front stairs with Chief Justice Roberts.
Later in the afternoon, the president will meet behind closed doors with Secretary of Defense Robert Gates in the Oval Office.