America : US President Donald Trump has lashed out at congressional Democrats after they vowed to summons the White House to produce documents this week.
Committees are demanding documents relating to the administration’s dealings with Ukraine, which is now at the heart of an impeachment inquiry.
The president accused Democratic leaders of dishonesty and even treason.
Democrats have defended the inquiry – which focuses on a phone call between Mr Trump’s and the Ukrainian president.
During a joint news conference with Finnish President Sauli Niinistö, Mr Trump called Mr Biden and his son, Hunter, “stone-cold corrupt”.
Mr Trump directed much of his anger towards House Intelligence Committee Chairman Adam Schiff, calling him “shifty Schiff, “a lowlife” and saying he “should resign from office in disgrace”.
He added: “Frankly, they should look at him for treason.”
Mr Trump also stated that he believed Mr Schiff had “helped write” a complaint about the call filed by a whistleblower, without offering evidence.