Trump sworn in as 45th president

Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open 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." 

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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 PenceDems face close polls in must-win Virginia Report: Trump administration officials urged furious Tillerson not to quit Authorities recover 47 firearms in connection with Las Vegas shooter 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.