WASHINGTON (AP) — The Fifth Amendment right against self-incrimination being invoked by President Donald Trump's former national security adviser, Michael Flynn, is a bedrock legal principle. Flynn is refusing to provide documents to a Senate committee investigating Russian interference in the 2016 presidential election. A subpoena from the Senate intelligence committee requests a list of all contacts between Flynn and Russian officials over an 18-month period. The FBI would not be able to use the immunized testimony, or evidence derived from it, to build a case, though a witness can still be prosecuted for false statements or on the basis of other evidence of a crime.