U.S. President Donald Trump's new chief lawyer said on Thursday that if his client agrees to an interview with special counsel Robert Mueller, it should be limited to a few hours and focus on Russian tampering in the 2016 election.

Asked what questions might be appropriate, the lawyer Rudy Giuliani, a former New York mayor, suggested two: "Was there some agreement with the Russians? Was there any meeting of Trump with the Russians?"

A former federal prosecutor, Giuliani said he was the president's new chief counsel in the Russia investigation but that he would also keep an eye on a U.S. inquiry into a $130,000 hush payment by longtime Trump attorney Michael Cohen to a porn star who said she had a 2006 sexual encounter with Trump.