John Bolton

John Robert Bolton (born November 20, 1948) is an American lawyer and diplomat. He was the 27th United States National Security Advisor from April 9, 2018 through September 10, 2019. He has served in several Republican administrations. Bolton served as the U.S. ambassador to the United Nations from August 2005 until December 2006 as a recess appointee by President George W. Bush. John Bolton advocated the second war with Iraq. He resigned in December 2006. 
On March 22, 2018, President Donald Trump announced his appointment as National Security Advisor, to take office on April 9, 2018.
On September 10, 2019, Bolton turned in his resignation to the Trump administration.
A member of the Republican party, his political views have been described as American nationalist, conservative, and neoconservative. Bolton rejects the last term.
Bolton has openly thought about the idea of running for president in the 2024 United States presidential election to win the Republican nomination against former President Donald Trump.