BARACK Obama was the 44th president of the US, serving from 2009 to 2017.
Joe Biden, his former vice president, is now the nation's commander-in-chief following the inauguration on January 20, 2021.
Read our Inauguration Day 2021 live blog for the very latest news and updates on Joe Biden's swearing-in and Donald Trump's exit...
Can Barack Obama be vice president?
Barack Obama is not eligible to be a candidate for president or vice president.
No one can serve more than two terms as president, and Obama was president for eight years.
if a candidate is not eligible to be president, he or she may not attempt to become vice president.
What does the Constitution say?
These eligibility requirements are spelled out in the 12th and 22nd Amendments of the Constitution.
The 22nd Amendment reads: "No person shall be elected to the office of the President more than twice, and no person who has held the office of President, or acted as President, for more than two years of a term to which some other person was elected President shall be elected to the office of President more than once.
"But this Article shall not apply to any person holding the office of President when this Article was proposed by Congress, and shall not prevent any person who may be holding the office of President, or acting as President, during the term within which this Article becomes operative from holding the office of President or acting as President during the remainder of such term."
And according to the 12th Amendment, "no person constitutionally ineligible to the office of President shall be eligible to that of Vice-President of the United States."
Gary Nordlinger of George Washington University told WUSA9 that "it's been interpreted to say that the vice president has to have the same qualifications as the president."
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"If anyone tried this it would for sure end up at the Supreme Court.
"Because that’s who decides conflicts within the Constitution.”
Candidates who want to be president also must be born in the US and 35 or older.