John Bolton is an American attorney and diplomat who served as the National Security Advisor under President Donald Trump from April 2018 to September 2019. He is known for his hawkish foreign policy views and has held various positions in government, including serving as the U.S. Ambassador to the United Nations from 2005 to 2006. Bolton has been involved in several key international issues, advocating for a strong stance against countries like Iran and North Korea. He is also a founding member of the Project for the New American Century, a think tank that promotes American global leadership and military strength.