What did the President know and when did he know it?

The question in the title should sound familiar to those of you who are old enough to remember Watergate. It was asked repeatedly by Senator Howard Baker (R-Tn), the ranking minority member of the Senate Select Committee that investigated the Watergate scandal in 1973-74 (not to be confused with James 'F**k the Jews, They Don't Vote for Us Anyway' Baker, who was Secretary of State under Bush I).