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WASHINGTON � Unions representing staff in U.S. Department of Agriculture's research, animal health and nutrition agencies warned lawmakers of political interference and irreparable damage to their work from President Donald Trump's effort to shrink the federal governmen.

More than 15,000 USDA staff have been fired or accepted Trump's financial incentives to leave the agency, leaving fewer experts to respond to an ongoing outbreak of bird flu and draining technical staff from local offices that serve farmers.