Housing and Urban Development (HUD) Secretary Julián Castro says President-elect Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests 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.

So Trump-- the shadiest, most corrupt guy to take the Oval Office, will have no strong federal checks and balances. Has to change. #2018 — Julián Castro (@JulianCastro) December 27, 2016

Trump is so corrupt that if Democrats controlled even one chamber of Congress, he'd be done before he even got started. #2018 — Julián Castro (@JulianCastro) December 27, 2016

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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 Cruz Rafael (Ted) Edward CruzCruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP MORE (R-Texas).

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