Since all men are mortal and Socrates is a man, Socrates is mortal.
("all men are mortal" and "Socrates is a man") are the PREMISES, while "Socrates is mortal" is the conclusion.
"It's a well-known fact that both John and Robert Kennedy both had affairs with Marilyn Monroe."
"That's just a Republican premise. There's no verifiable evidence either man knew her apart from professionally as an entertainer."