HONG KONG—Former White House chief strategist Steve Bannon speaks with President Donald Trump every two to three days, he told a private lunchtime gathering Tuesday in Hong Kong, some three weeks after the adviser left his administration job.

Mr. Bannon said he most recently spoke with Mr. Trump the previous night for an hour, according to two people who attended the closed-door meeting with the former presidential adviser. The gathering, at a Grand Hyatt hotel restaurant, included a group of about 20 money managers.

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