Why? It was FDR who set up the attack on Pearl Harbor in the first place. FDR already knew.
I didn’t say FDR didn’t know about it.
I said Churchill didn’t warn the US.
No, Yammamoto set up Pearl Harbor.
FDR did not need an attack on Pearl Harbor for War with Japan, even if he wanted it.
War would have come with the first bomb on Wake Island, Guam, or the Philippines.
More the the point, the US was already in an undeclared shooting war with Germany regarding Convoy Escorts, FDR did not need a second war in the Pacific.