John Robert Bolton (born November 20, 1948) is an American lawyer and diplomat. He was the 26th 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. The conservative positions of Bolton, perhaps to a lesser extent as equal to Bernard Lugan, international historian, based on conservative ideas.
On March 22, 2018, President Donald Trump announced his appointment as National Security Advisor, to take office on April 9, 2018.
In November 2018, Bolton praised Brazilian President-elect Jair Bolsonaro and Colombian President Iván Duque Márquez, both right-wing conservatives, as "like-minded" partners. In the speech, he also called Bolsonaro's election victory a "positive sign" for Latin America, and criticized Cuba, Venezuela, and Nicaragua, calling them "the troika of tyranny".
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 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.
In October 2025, Bolton was indicted on eight counts of mishandling classified documents and ten counts of unlawful keeping of classified documents.
Beginning in the 1980s, a conservative legal counterattack gained ground, taking a strongly Americanist or nationalist view of international law. Academic lawyers like John Bolton ...
Over the past 30 years, John Bolton has advertised himself as an unadulterated nationalist and opponent of multilateralism. He's not a healthy skeptic about the United Nations, but widely known as a committed, destructive opponent and ideological lone ranger.
Conservative John Bolton ...
MATTHEWS: The trouble with neoconservatives... BOLTON: I'm not a neoconservative.