Trump sworn in as 45th president

Donald TrumpDonald TrumpNew Capitol Police chief to take over Friday Overnight Health Care: Biden officials says no change to masking guidance right now | Missouri Supreme Court rules in favor of Medicaid expansion | Mississippi's attorney general asks Supreme Court to overturn Roe v. Wade Michael Wolff and the art of monetizing gossip 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 PenceGOP's Banks burnishes brand with Pelosi veto Trump called crowd gathered before Jan. 6 riot 'loving' Jill Biden takes starring role at difficult Olympics 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.