WASHINGTON—U.S. investigators have examined contacts Attorney General Jeff Sessions had with Russian officials during the time he was advising Donald Trump’s presidential campaign, according to people familiar with the matter.

The outcome of the inquiry, and whether it is ongoing, wasn’t clear, these people said. The contacts were being examined as part of a wide-ranging U.S. counterintelligence investigation into possible communications between members of Mr. Trump’s campaign team and Russian operatives, they said.

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