Articles of impeachment against Homeland Security Secretary Alejandro Mayorkas, over his handling of the border, were officially transmitted to the Senate on Tuesday.

       The House impeachment managers, selected by Republican leadership, walked the two articles through the Capitol led by the House clerk and sergeant-at-arms.

       The charges against Mayorkas were read aloud from the Senate dais by House Homeland Security Committee Chairman Mark Green.

       Mayorkas is only the second Cabinet secretary to be impeached in U.S. history after William Belknap, a former secretary of war, in 1876.

       Tuesday's procession kickstarted trial proceedings in the Senate, where lawmakers will be sworn in as jurors on Wednesday at 1 p.m., according to Majority Leader Chuck Schumer.

       MORE: Mayorkas impeachment trial: What to expect in the Senate

       House Republican impeachment managers walk to deliver the articl...Show more ---Show more

       Ken Cedeno/Reuters

       House Republicans voted to impeach Mayorkas in mid-February over what they said was his failure to enforce border laws amid a surge in migrants arriving at the U.S.-Mexico border. The controversial vote, which had previously failed, was opposed by three Republicans and all Democrats.

       The charges accuse Mayorkas of "willful and systemic refusal to comply with the law" and "breach of public trust" -- allegations he's called "baseless."

       A Homeland Security official, defending Mayorkas, said Congress should have impeached every secretary since the department’s inception if detaining all migrants is a requirement of the job -- and no administration has detained 100% of people suspected of crossing the border illegally

       The House impeachment managers also include Foreign Affairs Committee Chairman Michael McCaul and Reps. Andy Biggs, Ben Cline, Andrew Garbarino, Michael Guest, Harriet Hageman, Clay Higgins, Laurel Lee, August Pfluger and Marjorie Taylor Greene.

       Republican impeachment managers from the House of Representati...Show more ---Show more

       Win Mcnamee/Getty Images

       Top Republicans have demanded a complete Senate trial.

       "It would be beneath the Senate's dignity to shrug off our clear responsibility and fail to give the charges we'll hear today the thorough consideration they deserve," Senate Minority Leader Mitch McConnell said. "I'll strenuously oppose the effort to table the articles of impeachment and avoid looking at the Biden administration border crisis squarely in the face."

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       Still, chances of a full-scale trial are slim, though exactly how the impeachment proceedings will play out is still unclear.

       The Senate has the option to either dismiss the trial outright or to require a committee to hear it instead, which Democrats are largely expected to pursue.

       Homeland Security Secretary Alejandro Mayorkas testifies before th...Show more ---Show more

       Jose Luis Magana/AP

       MORE: House Republicans impeach Homeland Security Secretary Mayorkas in historic, controversial vote

       Mayorkas was on Capitol Hill earlier Tuesday to push lawmakers for more funding for the department as he testified about President Joe Biden's 2025 fiscal year

       “The dedicated public servants of DHS deserve full support, and the American people deserve the results a fully resourced DHS can deliver," Mayorkas told lawmakers.

       ABC News' Mariam Khan and Quinn Owen contributed to this report.