Sean Cairncross

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Sean Cairncross is an American lawyer and political operative who has served as the United States national cyber director since 2025. Cairncross served as the chief executive officer of the Millennium Challenge Corporation from 2019 to 2021. Cairncross served as the deputy counsel for the Republican National Committee, later becoming the committee's chief counsel. In 2013, he left the committee to become a partner at Holtzman Vogel Josefiak. By October 2015, Cairncross had become the chief operating officer of the Republican National Committee. After Donald Trump's first inauguration, he served as a deputy assistant to the president and the senior advisor to Reince Priebus, the White House chief of staff. Following Priebus's resignation, Cairncross remained within the White House in an unclear position. In January 2018, Trump nominated Cairncross to serve as the chief executive officer of the Millennium Challenge Corporation. He was confirmed by the Senate in July 2019. Cairncross returned...

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