Obama announcement on Rahm Emanuel
US President Barack Obama is holding a briefing to announce the departure of Chief of Staff Rahm Emanuel, who is resigning to run for the post of Chicago mayor.
The position of chief of staff is considered one of the most influential in the White House, and presidential aides have admitted Mr Emanuel's departure will be a loss to the administration.
US sources said the likely interim replacement would be Pete Rouse, who served as Mr Obama's chief of staff in the US Senate.
- From the section US & Canada