Trump sworn in as 45th president

Donald TrumpDonald TrumpUS, South Korea can bury the trade barrier hatchet this week OPINION: Trump's right — GOP health bill is mean, mean, mean Pelosi on criticism of leadership: 'This is such a small item, it isn't about me' 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 PenceMike (Michael) Richard PenceGingrich: Trump will be reelected, then Pence will win in 2024 Funeral for the filibuster: GOP will likely lay Senate tool to rest This week: Senate races toward ObamaCare repeal vote 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.