NEW YORK, June 19: Former US president Bill Clinton says in his memoir to be released on Tuesday that his failure to capture Osama bin Laden was his "biggest disappointment", according to Newsweek magazine.

In an online exclusive, Newsweek reported that Clinton said he met his successor, George Bush, before leaving office, and told him what his "five biggest security problems would be - naming Osama bin Laden and Al Qaeda first, and Iraq last. He told Bush his own failure to get (Osama) bin Laden was 'my biggest disappointment'.

"Clinton also urged Bush to visit North Korea in an effort to seal an agreement that would get that nation to end its nuclear program. Clinton says Bush listened, then quickly changed the subject," Newsweek reported, citing the memoir. -AFP