Two Idiots from Earth: A Classic Science Fiction Short Story

A government official on a planet currently at war with earth, finds two supposed spies at a bar and suspects they are Terran agents. They are pretty 'dense' and after grilling them for a period of time, he follows up on a couple of tips they give him and their supposedly real reason for being on the planet. However, things change suddenly for the official and his race as the situation heats up.