WASHINGTON (Reuters) - President-elect Donald Trump's nominee for U.S. Secretary of Defense James Mattis will say on Thursday that the United States must confront Russian behavior when it is contrary to the interests of the United States.

Mattis, in a written response to the Senate Armed Services Committee considering his nomination, however added that he supported Trump's "desire to engage with Russia."

(Reporting by Idrees Ali and Phil Stewart; Editing by Howard Goller)

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