John Bolton is an American lawyer and diplomat who served as the 25th National Security Advisor of the United States from April 2018 to September 2019. He previously served as the United States Ambassador to the United Nations from August 2005 to December 2006. Bolton is known for his hawkish foreign policy views and his strong support for the use of military force. He has been a vocal critic of the Iran nuclear deal and the International Criminal Court. Bolton has also been a vocal advocate for regime change in countries such as North Korea, Syria, and Venezuela. He has been a frequent guest on Fox News and other conservative media outlets. Bolton is a graduate of Yale University and Yale Law School and has held various positions in the administrations of Ronald Reagan, George H. W. Bush, and George W. Bush.