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 TrumpIvanka Trump, Jared Kusher's lawyer threatens to sue Lincoln Project over Times Square billboards Facebook, Twitter CEOs to testify before Senate Judiciary Committee on Nov. 17 Sanders hits back at Trump's attack on 'socialized medicine' 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 CruzSenate GOP to drop documentary series days before election hitting China, Democrats over coronavirus Democrats play defense, GOP goes on attack after Biden oil comments Quinnipiac poll finds Biden, Trump tied in Texas MORE (R-Texas).

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