Trump sworn in as 45th president

Donald TrumpDonald John TrumpAssange meets U.S. congressman, vows to prove Russia did not leak him documents A history lesson on the Confederacy for President Trump GOP senator: Trump hasn't 'changed much' since campaign 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 PenceOPINION | There is no Trump administration Pence responds to Trump remarks: 'I stand with the president' DeVos charges ahead on school choice 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.