President Joe Biden and former President Donald Trump are expected to move much closer to winning their party's nominations during the biggest day of the primary campaign on Tuesday.

(Photo : BRENDAN SMIALOWSKI,JIM WATSON/AFP via Getty Images)
(COMBO) This combination of pictures created on October 22, 2020 shows US President Donald Trump (L) and Democratic Presidential candidate and former US Vice President Joe Biden during the final presidential debate at Belmont University in Nashville, Tennessee, on October 22, 2020.

The contest sets up a historic rematch as Super Tuesday elections are held in 16 states and one territory. Hundreds of delegates hang in the balance as voters make their way to the polls.

Super Tuesday is normally the biggest day nationwide for primary elections and caucuses before the actual Election Day in November. Voters in 16 states and one territory will cast ballots for who they want to run for president. While much focus is on the presidential race, there are other important runs to consider.

California voters will determine the candidates who will compete to fill the Senate seat, previously long-held by Dianne Feinstein until her death last year.

North Carolina, a state that both parties are closely battling for the governor's race, will also take shape at the polls. The major competition centers around Biden and Trump. The two men have easily outwon their challengers and are in full command of their bids despite polls indicating that voters do not want this year's general election identical to the 2020 race.

A new AP-NORC Center for Public Affairs Research poll finds a majority of Americans don't think either Biden or Trump has the necessary mental acuity for the job.

"Both of them failed, in my opinion, to unify this country," said Brian Hadley, 66, of Raleigh, North Carolina.

"Fight Your Fight Yourself"  

Trump and Biden will not be able to solidify their party's nomination, as the earlier either can become his party's presumptive nominee is March 12 for Trump and March 19 for Biden.

Trump and Biden continue to hold rival campaign events. Last week, both frontrunners organized an event along the U.S.-Mexico border to gain an advantage in the increasingly worrying immigration debate.

Following the Supreme Court ruling on Monday to restore Trump to primary ballots following attempts to ban him for his role in helping to incite the Capitol riot, the former president pointed to the 91 criminal counts against him to turn it around on Biden, claiming the president is weaponizing the courts.

"Fight your fight yourself," Trump said. "Don't use prosecutors and judges to go after your opponent." Biden will campaign in key swing states, Pennsylvania and Georgia after he delivers the State of the Union address on Thursday.

He will tackle policies responsible for "record job creation, the strongest economy in the world, increased wages and household wealth, and lower prescription drug and energy costs," White House communications director Ben LaBolt said in a statement.

LaBolt revealed that's in contrast to Trump's "Make America Great Again" movement, which consists of "rewarding billionaires and corporations with tax breaks, taking away rights and freedoms, and undermining our democracy."