(Brendan Hoffman/Getty Images)

Sources tell ABC News that President Obama has decided that he will nominate Sen. John Kerry, D-Mass., to be secretary of state.

For a variety of reasons including the finalization of the process, other pending Cabinet decisions, and - more immediately - the national reaction to the tragic shooting at Sandy Hook Elementary School, the news will not be announced in the next few days.

Secretary of State Hillary Clinton, who is recovering from an illness and a concussion she suffered upon fainting because of that illness, is set to retire in the next few weeks.

- Jake Tapper