President Roosevelt (FDR) provoked the attack, knew about it in advance and covered up his failure to warn the Hawaiian commanders. FDR needed the attack to sucker Hitler to declare war, since the public and Congress were overwhelmingly against entering the war in Europe. It was his backdoor to war.
See this extensive site at What Really Happened
"You know I am a juggler, and I never let my right hand know what my left hand does. I'm perfectly willing to mislead and tell untruths..."
FDR, May 1941 (Morgan p 550)
FDR SCANDAL PAGE