James Buckley, a former US senator from New York and judge on the US Appeals Court for the District of Columbia Circuit, died on Friday at the age of 100.
Buckley, the older brother of National Review founder William F. Buckley Jr., is one of the few people to have served in the executive, legislative and judicial branches of the Federal government.

Republican presidential candidate Ronald Reagan, left, and former New York US Sen. James Buckley chats at a fundraising cocktail party sponsored by friends of the conservative party, in New York, Jan. 15, 1980. (AP Photo/Carlos Rene Perez, File)

James Buckley (Getty Images, File)
The former judge died at a hospital in Washington, DC, according to his son, David Buckley, of Arlington, Virginia.
Buckley was born on March 9, 1923. He attended Millbrook School in New York and then Yale, where he majored in English. He served in the Navy and fought in the Far East during World War II. Later, he went to Yale Law School and became a corporate lawyer.
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In 1953, Jim Buckley married Ann Frances Coole, who died in 2011.

William F. Buckley Jr., left, joins in celebrating the victory in the US Senatorial race in New York by his brother James Buckley, right, at the latter’s campaign headquarters in New York City, Nov. 3, 1970. (Getty Images, File)
His illustrious political career began when he managed his brother’s mayoral campaign in 1965.
He went on to become a senator in 1970 as part of the Conservative Party of New York.
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Buckley is famous for challenging campaign finance laws in a post-Watergate world in the landmark Supreme Court case Buckley v. Valeo.

William F. Buckley, Jr., right, founder of National Review, reviews the program with three guests, during the conservative magazine’s 20th anniversary celebration. Buckley with his brother, Sen. James L. Buckley (C-NY), left, former California Gov. Ronald Reagan, center, and Sen. Barry Goldwater (R-AZ). (Getty Images, File)
In March 1974, Buckley shocked Republicans by calling on President Richard Nixon to resign and pull the country “out of the Watergate swamp” and save the presidency.
Buckley lost his senate seat in a re-election campaign to Democrat Daniel Patrick Moynihan in 1976, the same year he officially switched to the Republican Party.
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He later served in the Reagan administration as an undersecretary for security assistance at the US Department of State and was later appointed by Reagan to a position as a judge on the US Court of Appeals for the District of Columbia Circuit.
The Associated Press contributed to this report.