President Barack Obama and French President Nicholas Sarkozy are again mutually calling for Iran not to develop a nuclear weapons programme.

Obama says he appreciates Sarkozy's leadership on a host of issues. Speaking with reporters after a meeting today, the US president reaffirmed that there must be "tough diplomacy" with Tehran on this issue.

Sarkozy agreed with Obama's call for Israel to stop building settlements in the West Bank, and said he worries about "insane statements" by President Mahmoud Ahmadinejad.

Obama said he and Sarkozy will work "in close collaboration" on many issues, including anti-terrorism strategy.

Sarkozy said France would accept some Guantanamo detainees, as the U.S. has requested.