Tonight’s episode of “Saturday Night Live” began with just a few surprises: First, a visit again in time to the signing of the Declaration of Independence and, second, a cameo look from Lin-Manuel Miranda as Alexander Hamilton. The “Hamilton” creator’s triumphant reprisal of his Broadway function was rapidly interrupted, nevertheless, by “SNL” forged member James Austin Johnson’s return as President Trump. “In America, we will have leaders, but know one thing: In America, we will never have a king!” Miranda sang, just for Johnson’s Trump to slip into body and proclaim, “By no means . . . Learn Extra