While on food, US President Barack Obama had a private lunch with his former Secretary of State Hillary Clinton at the White House, raising speculation about her much-rumoured run in the 2016 presidential elections.

Though the lunch was initially scheduled in the private dining room right off the Oval Office, the two decided to dine together outside during a pleasant summertime afternoon yesterday.

"It is largely friendship that's on the agenda for the lunch today. So it's not a working lunch as much as it is an opportunity for the two who saw each other on a pretty frequent basis over the course of the last four years to get a chance to catch up," White House Press Secretary said.

It is Obama who had invited Clinton for lunch; the first since February when she left her position as the Secretary of State, which she served successfully for four years in the first term of the Obama Administration.