WASHINGTON — Nicholas Calio, Citigroup Inc.'s head of global government relations since 2003, is leaving the company to run the Air Transport Association.

Considered one of Washington's top lobbyists, the move is a blow to Citi, particularly as the Republicans just won control of the House and picked up seats in the Senate. Although Calio has long-established relationships with members of both political parties, he has worked for two Republican administrations and is close to Rep. John Boehner, who is expected to be the next Speaker of the House.

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