Rahm Emanuel, President Barack Obama's chief of staff, will leave the White House today to launch a bid to become the mayor of Chicago.
"It's an emotional day for Rahm," an official told ABC News.
White House senior adviser Pete Rouse, who served as chief of staff to then-Sen. Obama, is expected to become interim chief of staff, although the White House has not officially confirmed the news.
Obama is expected to announce the staff change this morning at the White House.
"[Emanuel] has been...Full Story