Jerrold Nadler, chairman of the judiciary panel, and Adam Schiff, head of the intelligence panel, said in a joint statement that Mueller had agreed to testify after the two committees issued subpoenas on Tuesday.

Mr.Mueller's report, released publicly in April, found Russia had meddled in the 2016 US presidential election and that President Donald Trump's election campaign had multiple contacts with Russian officials.

But the report found insufficient evidence to establish a criminal conspiracy between the campaign and Moscow.

The report, which was partially redacted, also outlined instances in which the President tried to interfere with Mueller's investigation, but declined to make a judgment on whether that amounted to obstruction of justice.

The President said the findings were a complete exoneration from what he called a witch hunt mounted by Democrats frustrated by his election victory.

"Americans have demanded to hear directly from the Special Counsel so they can understand what he and his team examined, uncovered, and determined about Russia's attack on our democracy, the Trump campaign's acceptance and use of that help, and President Trump and his associates' obstruction of the investigation into that attack," the statement from the two House Representatives said.

Australian Associated Press