U.S. Defense Secretary Jim Mattis says the U.S. cannot afford to ignore destabilizing moves by Iran, but has no plans to respond by increasing American military forces in the Middle East.
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Mattis spoke at a joint news conference in Tokyo with his Japanese counterpart, Tomomi Inada.
Mattis was asked about the White House's statement this week that it was putting Iran "on notice."
Mattis held a series of high-level meetings in Seoul and Tokyo this week on his first overseas trip as Pentagon chief. He was returning to Washington Saturday.