Fruit of the Poisonous Tree

Fruit of the poisonous tree is a legal metaphor used to describe evidence that is obtained illegally. The logic of the terminology is that if the source of the evidence or evidence itself is tainted, then anything gained from it is tainted as well.           Wikipedia





HERE'S THE RUB...
Even though Michael Flynn plead guilty to lying to the FBI, that guilty plea is considered fruit of the poisonous tree because it was obtained illegally.