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 and the Ukrainian president.
Warning: this report contains strong language
What did President Trump say?
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 whistle-blower, without offering evidence.
The US president told reporters that only “legitimate” whistle-blowers should be protected.
“This country has to find out who this person was, because that person’s a spy, in my opinion,” Mr Trump said.
He labelled the entire inquiry a “hoax” and a “fraudulent crime on the American people” while maintaining he would “always co-operate” with Congress.
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