U.S. Capitol Police stand guard on a plaza surrounding the Capitol before Congress meets to certify the electoral college vote.
U.S. Capitol Police stand guard on a plaza surrounding the Capitol before Congress meets to certify the electoral college vote for President-elect Joe Biden in Washington, Jan. 6, 2021.

Lawmakers from the U.S. Senate and House of Representatives are scheduled to meet Wednesday in a joint session of Congress to count and certify electoral votes based on the result of the November presidential election.  

This usually routine and ceremonial function — a final step after the Electoral College officially elected Joe Biden on December 14 — has turned into a litmus test of Republican lawmakers' loyalty to President Donald Trump. More than 100 Trump loyalists are set to challenge certification.

WATCH: Joint Session of Congress

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Here's what we can expect from the meeting.  

What usually happens?  

Under the 12th Amendment, both chambers must meet to officially count and certify the Electoral College results from all 50 states and the District of Columbia.  

Representatives of the Democratic and Republican parties in the Senate and House are appointed as "tellers" from each chamber. Vice President Mike Pence, in his capacity as president of the Senate, presides over the joint session. If he cannot preside, the longest-serving senator in the majority party, in this case, Republican Sen. Chuck Grassley of Iowa, leads the session as the Senate president pro-tempore.  

FILE - Vice President Mike Pence, center, applauds after NATO Secretary General Jens Stoltenberg, left, addressed a Joint Meeting of Congress on Capitol Hill in Washington, April 3, 2019.

Senate pages — high school students from all 50 states — bring mahogany wood boxes filled with the sealed envelopes of certified electoral votes from the 50 states. The presiding officer opens and presents sealed certificates in alphabetical order of the states. The appointed "tellers" from each chamber read each certificate out loud to officially record and count the votes.  

The process continues until all the votes are announced and counted. The presiding officer then announces who has won the majority votes for both president and vice president.    

What is expected to happen?  

In a last-ditch attempt to keep Trump in the White House, more than a hundred Republican House members and a dozen senators have said they plan to object to the electoral college tally from some or all of six swing states won by Biden — Arizona, Georgia, Michigan, Nevada, Pennsylvania and Wisconsin — and demand that a commission be established to audit the election results.  

FILE - Members of Arizona's Electoral College stand as they take a photo with signed commemorative copies of the Arizona Presidential Electoral Ballot after casting their votes in the Arizona Electoral College, in Phoenix, Dec. 14, 2020.

Most of the senators who plan to object represent states where Trump remains very popular. 

Their objections are expected to fail as Democrats control the House and are unified in their support for Biden. The Senate, although narrowly controlled by the Republicans, is not likely to vote in favor either, with several GOP senators already stating they are against throwing out any state's certified election result.  

Still, with two hours of debate permitted for each objection, plus the time needed for votes in each chamber, the typically short ceremony will likely turn into a prolonged event.  

Jason Grumet, president of the Bipartisan Policy Center, called the Republican lawmakers' move "incredibly troubling."  

"It is not conservative, it is not partisan, it is not patriotic," Grumet said. "It is simply a self-interested effort by some ambitious politicians to challenge the outcome of an election, which by all accounts was conducted exceptionally well."  

The Trump campaign and the president's allies have launched 61 lawsuits challenging the results of the election in a number of states. They have lost 60, after failing to provide evidence supporting their claims of widespread fraud.  

What is the president's role in this?  

Trump, who won 232 Electoral College votes compared to Biden's 306, has not conceded that he lost. He has pressured Republican lawmakers and officials to overturn the result of the election, often by wielding the power of his base that could make or break political fortunes.  

Trump's pressure campaign was captured in an hourlong phone call on Saturday, where he urged fellow Republican Brad Raffensperger, Georgia's secretary of state, to "find" enough votes to overturn his electoral defeat.  

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In a press conference Monday, Gabriel Sterling, the states' voting system implementation manager, said the secretary's office released the recording "out of an abundance of caution" given the current political environment and the president's track record.  

"Sometimes he [Trump] doesn't necessarily characterize things as they might have actually occurred," Sterling said.  

Trump, who calls Republicans who refuse to support him the "Surrender Caucus," is also calling on Pence to take action to overturn the election, despite the Constitution and the Electoral Count Act defining the vice president's role in the states' electoral vote count largely as a ceremonial one.  

"I hope that our great vice president comes through for us. He's a great guy," Trump said at a rally in Georgia on Monday night. "Of course, if he doesn't come through, I won't like him quite as much."

On Tuesday, several media outlets including The New York Times reported that Pence told Trump he did not believe he had the power to block the certification.  

In a statement released late Tuesday, Trump called the reports “fake news.”

“The vice president and I are in total agreement that the vice president has the power to act,” Trump said. “Our vice president has several options under the U.S. Constitution. He can decertify the results or send them back to the states for change and certification.” 

“I think his [Trump’s] endgame is to not be a loser,” said Jennifer Mercieca who teaches presidential rhetoric at Texas A&M University. “So that means continuing to fight even when the fight is over.” 

The presidential pressure has created an awkward choice for Pence, who until now has demonstrated unflinching loyalty to Trump.         

David C. Barker, director of the Center for Congressional and Presidential Studies at American University, said that if Pence wants to be a viable candidate for president in 2024, he may have to join the chorus of Republican lawmakers who continue to enable Trump’s gambit.      

“He may decide that he cares more about his conscience than his career,” Barker said. “We’ll see.”      

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The president has also called on his supporters to gather in Washington on Wednesday, prompting the city's mayor to urge residents "not to engage with demonstrators who come to our city seeking confrontation."  

The mayor has activated more than 300 members of the National Guard to assist local law enforcement. On Wednesday, Trump is scheduled to address his supporters outside the White House.     

Has this ever happened before?  

Democrats launched small-scale and short-lived objections to electoral vote counts in 2001, 2005 and 2017.  

In 2001, more than a dozen House members tried to object to electoral votes in Florida, the state where Vice President Al Gore lost to George W. Bush by a razor-thin margin, after a recount battle decided by the U.S. Supreme Court. In his capacity as president of the Senate, Gore overruled the objections and announced Bush as the winner.  

In 2005, Sen. Barbara Boxer, D-Calif., joined Rep. Stephanie Tubbs Jones, D-Ohio, in objecting to Ohio's votes. The move failed by large margins in both chambers and was not supported by the defeated Democratic nominee, John Kerry.  

Some House Democrats objected to the votes for Trump in several states in 2017 but were overruled by then-Vice President Joe Biden.

The objection is unlikely to succeed but what happens if it does?  

Trump and his allies hope that the challenge will result in some of Biden's electoral votes being tossed out, reducing them below the 270-threshold needed to win.  

FILE - President-elect Joe Biden speaks after the Electoral College formally confirmed his election win, at The Queen theater in Wilmington, Delaware, Dec. 14, 2020.

Under the 12th Amendment to the Constitution, if no candidate receives an absolute majority of the electoral votes, the House of Representatives is required to go into session immediately to choose a president.  

"There is absolutely no chance that this effort, which is basically political theater, will prevent Joe Biden from becoming president of the United States," said Grumet, of the Bipartisan Policy Center.  

But Grumet said this effort is damaging to American democracy.  

"Small bad precedents often become big bad precedents," Grumet said. "We hopefully have not created now a tradition in which people who are basically sore losers take it upon themselves to question the legitimacy of tens of millions of American voters."  

The objection has also widened the rift between establishment Republicans and populist Republicans, both of which are seeking control over the direction of the party.  

"January 6th will be the opening shot in a long-term effort to define the soul of the Republican Party," GOP pollster Whit Ayers said.  

What follows will depend on what Trump does after he leaves office, Ayers said. "How active he remains, and how much political influence he retains once he no longer has the power of the presidency at his disposal," he added.   

When will it end?  

Despite the certification vote potentially dragging on for days, and some of the president's legal challenges technically still pending in the courts, on January 20, the White House almost certainly will have a new occupant as Biden is to be sworn in as the 46th U.S. president.