President Donald Trump’s oldest son has agreed to testify privately to the Senate Judiciary Committee’s Russia probe, CNN reports.

The Committee, which is looking into allegations of Russian interference in the US election, invited Donald Trump Jr to testify in a public July hearing.

Spokesmen and spokeswomen for the committee’s leaders did not immediately respond to requests for comment on Tuesday’s report.

CNN also reported that Special Counsel Robert Mueller had issued subpoenas to Melissa Laurenza, an attorney with the Akin Gump law firm, who formerly represented President Trump’s former campaign manager, Paul Manafort, and to Jason Maloni, a Manafort spokesman.

CNN said Mr Maloni and a spokesman for Mr Mueller declined comment and that Ms Laurenza referred questions to a spokesman who did not immediately comment.

Russia has loomed large over the first six months of the Trump presidency.

US intelligence agencies have concluded that Russia worked to tilt last year’s presidential election in President Trump’s favour.

Mr Mueller, who was appointed special counsel in May, is leading the investigation, which also examines potential collusion by the Trump campaign with Russia.

Several congressional committees are also looking into the matter.

Moscow denies any meddling. President Trump denies any collusion by his campaign, while regularly denouncing the investigations as political witch hunts.