(CNN) The security detail for Education Secretary Betsy DeVos is projected to cost $7.74 million for the 2019 fiscal year, according to US Marshals Service spokeswoman Nikki Credic-Barrett. That would be about $1 million more than this year.

The projection was higher than previous years because of estimates for cost of living increases and increases in travel and per diem costs, according to Credic-Barrett. Politico first reported the projected cost of her detail.

DeVos started using a security detail from the US Marshals Service in February 2017 at the direction of Attorney General Jeff Sessions after her contentious confirmation battle and an encounter with protesters at a middle school in Washington. It is uncommon for the Marshals Service to protect Cabinet members, who usually receive security protection through their individual agencies.

The Marshals Service conducted a threat assessment for DeVos and determined that a threat to her safety existed, Credic-Barrett said in an email. The US Marshals conduct regular threat assessments on the secretary to determine threats to her safety, Credic-Barrett said.

For "operational security," the US Marshals Service would not "disclose the number of employees providing protection or the nature of threats against the secretary," according to a statement from the agency.

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