Donald Trump and Joe Biden have been confirmed as presidential candidates after the pair romped to victory in their respective primaries.
In a rematch of the 2020 election, the pair will be going head to head at the polls in November.
Republican candidate Trump said it was a "great honour" after clinching the 1,215 delegates required to secure the Republican presidential nomination.
Meanwhile, a spokesperson from the President Biden campaign said "I believe that the American people will choose to keep us moving into the future."
The pair will be going head to head in November
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It is set to be the first presidential election rematch in nearly 70 years.
Trump clinched the 1,215 delegates required to secure the Republican presidential nomination as four states held contests, including Georgia, the battleground where Trump faces criminal charges for his efforts to overturn the state's 2020 results. There were 161 delegates at stake on Tuesday in Georgia, Hawaii, Mississippi and Washington state.
Meanwhile, Biden won enough delegates in Georgia almost immediately to win the Democratic nomination, which required 1,968 on the first ballot to win.
In a statement, President Biden said: "Four years ago, I ran for president because I believed we were in a battle for the soul of this nation. Because of the American people, we won that battle, and now I am honored that the broad coalition of voters representing the rich diversity of the Democratic party across the country have put their faith in me once again to lead our party – and our country – in a moment when the threat Trump poses is greater than ever"
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President Biden said the threat Donald Trump poses is "greater than ever"
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In a statement on his Truth Social page, Donald Trump wrote: "It is my great honor to be representing the Republican Party as its Presidential Nominee.
"Our Party is united and strong, and fully understands that we are running against the Worst, Most Incompetent, Corrupt, and Destructive President in the History of the United States. Millions of people are invading our Country, many from prisons and mental institutions of other Countries.
"High-Interest Rates and Inflation are choking our great middle class, and ALL, our Economy is bad, and our Stock Market is rising only because Polls are strongly indicating that we will WIN the Presidential Election of 2024."
The outcome of Tuesday's voting was essentially predetermined, after Trump's last remaining rival for the Republican nomination, former U.N. Ambassador Nikki Haley, ended her presidential campaign following Trump's dominant performance last week on Super Tuesday.
Donald Trump is set to face off against 2020 rival President Joe Biden
ReutersThe last repeat presidential matchup took place in 1956, when Republican President Dwight Eisenhower defeated former Illinois Governor Adlai Stevenson, a Democrat, for the second time.
This year, voters have expressed little enthusiasm for a repeat of the bitter 2020 election, with Reuters/Ipsos public polls showing both Biden and Trump are unpopular with the majority of voters.
Trump's myriad criminal charges, he faces 91 felony counts across four separate indictments, could harm his standing among the suburban, well-educated voters whose support he has historically struggled to garner.