In Indiana Jones and the Kingdom of the Crystal Skull, a short while after the beginning of the movie, Irina Spalko captured Indy and forced him to lead the U.S soldiers military base which contains bunch of crates. Then, they opened a highly magnetic crate which contained a weird creature. Meanwhile, Indy attempted to escape, however the attempts failed because Mac was pointing a gun at Indy's head and then revealed he's a spy working for the Soviets. In that time, Indy and Mac had a conversation and then finally Spalko asked, 'No defiant last words, Dr. Jones?' to Indy. He replied, 'I like Ike'.
Here is the script of the movie:
INDY: Drop the guns, or Colonel Dr. Spalko is dead.
MAC TURNS HIS GUN ON INDY
INDY: Why, Mac?
MAC: Well, what can I say, Jonesey? I'm a capitalist, and they pay.
INDY: After all those years we spent spying on the Reds? I thought we were friends, Mac.
MAC: I've had a run of bad luck with the cards lately, mate. Awful. Bloody awful. I can't go home empty-handed again.
SPALKO: No defiant last words, Dr. Jones?
INDY: I like lke.
What does 'I like Ike' mean in this particular context?
Why does Indy say that?