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Washington • Sen. Mike Lee on Monday named a new chief of staff, elevating his administrative director Allyson Bell to the top spot in his Senate office.

Bell, a longtime Lee aide, will take over in January for outgoing chief of staff Boyd Matheson, who is leaving to work on Lee's re-election campaign.

"For the past three years, my team has been doing the hard work and heavy lifting to roll out a conservative reform agenda, based on Utah values, to unite our party and restore the greatness of our nation," Lee said in a statement. "This change is a natural extension of our continuous effort to take that agenda around the state and across the country."

Matheson had served as Lee's top aide for about three years.

Bell began working for Lee during his transition to office in 2010 and was his office's administrative director for the past five years. Previously, Bell worked for the Salt Lake Chamber of Commerce, Education First and at D.C.-based Nahigian Strategies. She spent 12 years working for Mike Leavitt when he was Utah's governor and continued working for him at the U.S. Environmental Protection Agency and the Health and Human Services Department.