When you're talking to the FBI it doesn't have to be under oath, just ask Martha Stewart. She got a year in jail for one untruthful statement.
You'd think it's implied. When talking to government, you are not allowed to lie. They can, but not the little people.
Dems usually won't shut up. Listen to the shit Hillary says every day. Bill, too.
It's not until they are under oath that they suddenly have nothing to say. The guy who helped with Hillary's personal server took the 5th 125 times while being questioned. If they don't admit something, it never happened and it doesn't matter how much proof there is. Like when Bill was caught, he continued to argue about the meaning of the word, "is."