Labor Secretary Tom Perez is using his position to try to build union support for Hillary Clinton. The Cabinet official has been doing campaign stops on her behalf, speaking to labor groups.

Perez met with two members of unions, Unite Here and the Service Employees International Union, in Las Vegas on Dec. 7.

"I'm proud as hell to endorse Hillary Clinton as the next president of the United States," Perez told SEIU members, according a YouTube clip the union posted. "What gets her up in the morning is all of the issues that you fight for every day."

It is unusual for sitting Cabinet members to campaign for a presidential candidate, but it is not unprecedented. Kathleen Sebelius, then the Health and Human Services secretary, was found in 2012 to have violated the Hatch Act when she campaigned for Obama at a taxpayer-funded event in North Carolina that year. The law that prohibits executive branch employees from engaging in political activity while on duty or in the federal workplace.

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