The first confirmation hearing for one of Biden's Cabinet picks is officially on the Senate schedule for the day before his inauguration -- which is also the earliest day the Senate is likely to accept an impeachment article against Trump from the House.

Department of Homeland Secretary nominee Alejandro Mayorkas' hearing will be at 10 a.m. on Tuesday, Jan. 19, the Senate Homeland Security and Governmental Affairs Committee announced Tuesday.

In the wake of the siege on the Capitol, the incoming Biden administration is making a push to prioritize confirmations for national security nominees, so those officials may assume their roles as early as next week.

Traditionally, the Senate has confirmed national security nominees on Inauguration Day, and did so for Department of Homeland Security secretary nominees in both 2009 and 2017.

Capitol Police have added new security measures to the House of Representatives -- requiring that all members and staff go through metal detectors before they enter the chamber, according to a new memo sent to offices by the acting House Sergeant at Arms.

The memo comes ahead of a vote Tuesday evening on a resolution pressing Vice President Mike Pence to mobilize the Cabinet and invoke the 25th Amendment to remove Trump from office.

Currently, visitors and staff are screened when they enter the Capitol building, but members of Congress are not. There are already metal detectors in place for visitors to the House galleries, which had been shuttered since March because of the pandemic.

Several lawmakers continue to worry about their safety in the wake of last week's Capitol riot -- and Democrats in control of the chamber have expressed concerns about some GOP colleagues and their alleged connections to the organizers. Some Republicans, most notably Rep. Lauren Boebert, R-Colo. have been outspoken about carrying weapons around the Capitol.

"Failure to complete screening or the carrying of prohibited items could result in denial of access to the Chamber," acting Sergeant at Arms Timothy Blodget wrote in the memo.

-ABC News' Benjamin Siegel and Mariam Khan

Aside from Trump's comments on the 25th Amendment, impeachment and last week's attack on the U.S. Capitol, the president's remarks alongside the border wall were notable in that he spoke -- both in tone and content -- as if he had accepted the end of his presidency was near.

His speech Tuesday reflected an attempt to spend one of his final days in office focused on highlighting what he believes are his accomplishments as president with his signature promise to build a wall among them.

Tump also warned that a "tidal wave" of undocumented immigrants would head toward the United States if his immigration policies are reversed.

"We can't let the next administration even think about taking it down," Trump said, referring to the barrier, although Biden has said he would not dismantle existing barrier -- just stop further construction.

"At this very moment, smugglers and coyotes are preparing to surge the border if our policies are loosened or removed," Trump said. However, Customs and Border Protection chief Mark Morgan told ABC News just a few weeks ago, "the in-flows [of immigrants at the border] have basically slowed to a trickle."

-ABC News' Quinn Owen, Ben Gittleson and John Parkinson

At the top of his remarks in Alamo, Texas, after making brief comments about the strength of the border wall, the president addressed the riot at the Capitol -- remarking that it “has been a difficult year and a difficult election."

“Free speech is under assault like never before,” Trump said -- calling the latest impeachment effort a "hoax" but threatening the efforts to remove him from office could haunt Biden.

“The 25th Amendment is of zero risk to me, but will come back to haunt Joe Biden and the Biden administration," Trump said. "As the expression goes, 'Be careful what you wish for."'

“Millions of our citizens watched last Wednesday as a mob stormed the Capitol and trashed the halls of government. As I have consistently said throughout my administration, we believe in respecting America’s history and traditions -- not tearing them down,” Trump said, reading from a teleprompter.

“We believe in the rule of law, not violence or rioting," he said, going on to describe the pandemic landscape. "This has been a difficult year and a very difficult election. The pandemic has made it a very, very difficult year for our country and virtually every country around the world. Now is the time for our nation to heal -- it is the time for peace and calm."

“Respect for law and law enforcement -- so many are here -- is the foundation of the MAGA agenda, and we are a nation of law and order. That is why we are here today: to talk about what we must do to uphold the rule of law in America and how we must continue to support our law enforcement heroes, which is exactly what you are," Trump said.

At the same time as Trump spoke, acting U.S. Attorney in the District of Columbia Michael Sherwin announced that more serious indictments against some already charged in the violent Capitol siege were imminent and said there were "pipe bombs" found outside the Capitol Wednesday.

Before Tump's remarks, Trump walked slowly to the border wall, lined with American flags. He bantered with border officials speaking as he gazed upon the wall before he approached a plaque and signed it.

-ABC News' John Parkinson and Ben Gittleson

The House of Representatives is poised to impeach President Trump for a second time on Wednesday for "incitement of insurrection," exactly one week after a violent siege on the U.S. Capitol left five people dead.

House Democrats have the votes to impeach Trump, who will become the first and only president in U.S. history to be impeached twice.

And in a turn of events, at least five House Republicans -- including No. 3 Rep. Liz Cheney -- have announced they, too, will vote to impeach Trump, even though no Republicans supported the effort during Trump's first impeachment proceedings related to the Ukraine matter in 2019. The other House lawmakers who say they'll vote to remove Trump include GOP Reps. John Katko, R-N.Y., Adam Kinzinger, R-Ill., Fred Upton, Mich., and Jaime Herrera Beutler, R-Wash.

House GOP leadership said they would not encourage members to vote for or against Democrats' impeachment push, according to House leadership aides, but to "vote their conscience."

In the Senate, Majority Leader Mitch McConnell has not said if he would vote to convict or whether he'd hold a trial in the Senate, ABC News has learned, but he has privately indicated he believes impeaching Trump could make it easier to rid the Republican Party of Trumpism.

-ABC News' Mariam Khan