Julián Castro, who served in former President Barack Obama Barack Hussein ObamaThe Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon Trump appointees stymie recommendations to boost minority voting: report Obama's first presidential memoir, 'A Promised Land,' set for November release MORE’s Cabinet, said Tuesday that only a Democratic majority can hold President Trump's administration accountable.

“Despite stark evidence Trump is unfit, GOP Congress won't hold him to account. Only a Democratic majority will do that. #11/6/2018 #vote!” Castro wrote on Twitter.

Despite stark evidence Trump is unfit, GOP Congress won't hold him to account. Only a Democratic majority will do that. #11/6/2018 #vote! — Julián Castro (@JulianCastro) May 16, 2017

The tweet from Castro, who served as secretary of Housing and Urban Development under Obama, comes as Democrats gear up to make the 2018 midterm elections a referendum on Trump's presidency.

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Castro also slammed the White House for its latest controversy Monday after The Washington Post reported that Trump provided highly classified intelligence to the Russian foreign minister and ambassador during a meeting last week in the Oval Office.

“These kinds of serious mess ups will keep happening w/ Trump. He's not knowledgeable/diligent enough to prevent them & he has a subpar team,” Castro wrote.

These kinds of serious mess ups will keep happening w/ Trump. He's not knowledgeable/diligent enough to prevent them & he has a subpar team. — Julián Castro (@JulianCastro) May 16, 2017

While senior White House officials denied that Trump supplied the Russians with sources and methods, Trump early Tuesday said he has “the absolute right” to share "facts" with Russia.

Castro’s comments also echo concerns among Democratic lawmakers over GOP majorities in the House and Senate as both chambers investigate Russia’s attempts to influence the U.S. presidential election.

House Minority Leader Nancy Pelosi (D-Calif.) on Tuesday said Republicans holding the power of subpoena is a deterrent towards a real investigation.

“The power of subpoena makes all the difference in the world and the majority owns the power of subpoena,” Pelosi said at the Center for American Progress’s ideas conference in Washington, D.C.