Ukraine and Joe Biden's son: an explainer

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U.S. Vice President Joe Biden (2nd L) waves after being sworn in by Supreme Court Justice John Paul Stevens (R) as the Biden children Beau (2nd R), Hunter (C), and wife Jill Biden (L) watch in Washington January 20, 2009. Credit: REUTERS/Jason Reed (UNITED STATES).

President Trump today dismissed allegations that he asked Ukraine’s president to dig up dirt on former Vice President Joe Biden. Biden hit back while he was on the campaign trail in Iowa this weekend, lambasting a reporter who asked him about his son Hunter Biden’s overseas business dealings. "Trump’s doing this because he knows I’ll beat him like a drum,” said Biden.