Julián Castro: Trump will be 'shadiest, most corrupt' president ever
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Housing and Urban Development (HUD) Secretary Julián Castro says President-elect Donald TrumpDonald John TrumpGOP congressman slams Trump over report that U.S. bombed former anti-ISIS coalition headquarters US to restore 'targeted assistance' to Central American countries after migration deal Trump says lawmakers should censure Schiff MORE the “shadiest, most corrupt” person ever to win the presidency.

In a series of tweets, Castro lamented GOP majorities in Congress, warning that Republicans will offer Trump no resistance while Democrats would be able to stop Trump if they had control of the Capitol.

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Castro, the former mayor of San Antonio, Texas, included in both tweets the hashtag #2018, referring to Democratic efforts to reclaim control of Congress.

His identical twin brother, Rep. Joaquín Castro (D-Texas), is considering a 2018 challenge to Sen. Ted CruzRafael (Ted) Edward CruzThe Hill's Morning Report - Dem debate contenders take aim at Warren The Hill's Morning Report - Trump grapples with Turkey controversy This week: Congress returns to chaotic Washington MORE (R-Texas).

President Obama appointed Julián Castro to lead HUD in 2014. Trump has nominated neurosurgeon Ben Carson to lead the department next.