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WASHINGTON (Reuters) - U.S. Senator Mark Warner, the top Democrat on the Senate Intelligence Committee, warned President Donald Trump on Tuesday over a possible pardon for his former campaign chairman, Paul Manafort.

“Any attempt by the President to pardon Mr. Manafort or interfere in the investigation into his campaign would be a gross abuse of power and require immediate action by Congress,” Warner, whose committee has been investigating Russia and the 2016 U.S. election campaign, said in a statement.