Obama Plans Nuclear Security Summit

President Obama said Wednesday night that he plans to host a nuclear security summit in Washington in March.

The Associated Press reports that Mark Lippert, Obama's deputy national security adviser, said the president revealed the plans at a dinner with world leaders at the G-8 summit in L'Aquila, Italy.

Lippert said that Mr. Obama believes the top short-term threat facing the United States is nuclear terrorism. The president is seeking to address the breakup of nuclear black markets and how best to detect nuclear materials when they are in transit, he said.

Lippert also told the AP that Mr. Obama plans to formally invite 25 to 30 leaders to the national security summit next week, after he returns to Washington.