Mattis is a political appointee as Secretary of Dept of Defense which means he serves at the pleasure of the president & the president can fire him for any reason at any time. Plus, it’s not this country’s job to solve the Middle East’s decades old intractable problems. The Israeli/Palestinean conflict is unsolvable because they both claim the same piece of land. The Saudi Arabia/Iran conflict is a religious conflict. Saudi Arabia is Sunni & Iran is shiite & they both think their type of islamic religion is the real islam. It’s not this country’s job to protect Europe which we have done for decades. European countries are rich enough to provide their own defense.