Trump sworn in as 45th president

Donald TrumpDonald John TrumpLincoln Project ad dubs Jared Kushner the 'Secretary of Failure' Pence: Chief Justice Roberts 'has been a disappointment to conservatives' Twitter bans Trump campaign until it deletes tweet with COVID-19 misinformation MORE was officially sworn in as the 45th president of the United States on Friday.

Supreme Court Chief Justice United States John Roberts administered the oath of office to Trump, as he vowed to "faithfully execute the Office of the President of the United States." 

ADVERTISEMENT

As he took the oath, Trump placed his hand on the Bible used by President Lincoln at his first inauguration, which was also used by President Obama at both of his inauguration ceremonies.

Moments before Trump's oath, Supreme Court Justice Clarence Thomas administered the vice president's oath of office to Mike PenceMichael (Mike) Richard PencePence: Chief Justice Roberts 'has been a disappointment to conservatives' Students at school system Pence called 'forefront' of reopening now in quarantine Presidential debates demonstrate who has what it takes MORE.

In 2009, President Obama had to retake the oath of office after Roberts stumbled on the wording. 

Roberts flubbed the oath, accidentally rearranging the word "faithfully." Obama then repeated the incorrect version, saying he would execute "the office of president of the United States faithfully."

President Obama re-did the oath of office hours later.