UK's Cameron says now is the time to stick with EU and other allies

"Britain's membership of the EU gives us a powerful tool to deliver on the prosperity and security that our people need and to stand up for the values that our countries share," Cameron told a news conference held with U.S. President Barack Obama.

He added: "Now I think is the time to stay true to those values and to stick together with our friends and allies in Europe and around the world."

(Reporting by Roberta Rampton and Kylie MacLellan; Writing by Ana Nicolaci da Costa; editing by Stephen Addison)