Mattis still saw Iran as the key destabilizing influence in the region. In private, he could be pretty hard-line, but he had mellowed. Push them back… - Bob Woodward

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Mattis still saw Iran as the key destabilizing influence in the region. In private, he could be pretty hard-line, but he had mellowed. Push them back, screw with them, drive a wedge between them and the Russians, but no war. Russia had privately warned Mattis that if there was a war in the Baltics, Russia would not hesitate to use tactical nuclear weapons against NATO. Mattis, with agreement from Dunford, began saying that Russia was an existential threat to the United States. Mattis had formed a close relationship with Tillerson. They tried to have lunch most weeks. Mattis's house was near the State Department and several times Mattis told his staff, "I'll walk down and say hello to him." McMaster considered Mattis and Tillerson "the team of two" and found himself outside their orbit, which was exactly the way they wanted it.