And concurrently served as NATO. S Supreme Allied Commander Transformation. He was commander of United States Central Command. From 2010 to 2013, with Admiral Bob Harward.Serving as his deputy commander. After retiring from the military, he served in several private sector roles, including as a board member of Theranos. Mattis was nominated as secretary of defense by president-elect Donald Trump. And confirmed by the Senate on January 20, 2017. As secretary of defense, Mattis affirmed the United States' commitment to defending longtime ally South Korea.
In the wake of the 2017 North Korea crisis. An opponent of proposed collaboration with China. Mattis stressed what he saw as their "threat to the American-led world order". Mattis occasionally voiced his disagreement with certain Trump administration policies such as the withdrawal from the Iran nuclear deal. Withdrawals of troops from Syria and Afghanistan, and budget cuts hampering the ability to monitor the impacts of climate change.
According to The Hill, Mattis also reportedly dissuaded Trump from attempting to assassinate Bashar al-Assad.