In a Tuesday interview, Paul said that the whistleblower - reported to be CIA officer Eric Ciaramella - "is a material witness to the possible corruption of Hunter Biden and Joe Biden," and that Congress should investigate the whistleblower's ties to the Biden family and Burisma holdings, the Ukrainian gas company that paid Hunter Biden to sit on its board, according to BuzzFeed.

"[The whistleblower] might have traveled with Joe Biden to Ukraine for all we know. We should look at his writings. We should know all of this stuff to see whether or not he has any intersection with Burisma and with Hunter Biden," said Paul.