Russia probe special counsel interviews ex-Trump chief of staff Priebus

President Donald Trump's former White House Chief of Staff Reince Priebus was interviewed on Friday by the special counsel investigating whether the Trump campaign colluded with Russia during the 2016 US election.

"Mr. Priebus was voluntarily interviewed by Special Counsel Mueller's team today," said his lawyer, William Burck. "He was happy to answer all of their questions."

Special Counsel Robert Mueller's investigators are interviewing a number of White House and other officials as part of the inquiry into any ties between Trump's presidential campaign and Russia.

Mueller's inquiry includes whether Trump might have obstructed justice by trying to persuade then-FBI Director James Comey to drop an investigation of Michael Flynn, the president's first national security adviser.