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Are there restrictions on how U.S. Rep. Joaquin Castro can promote his brother for president?

For his 2020 campaign for president, Julián Castro selected his twin brother, a Democratic representative from San Antonio, as his campaign chairman.

HUD Secretary Julián Castro, left, and his twin brother, U.S. Rep. Joaquin Castro, D-San Antonio, attend a Day of Action on Oct. 29, 2016, at the Travis County Democratic Party headquarters in Austin.


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