In the few days since he returned to the White House, President Donald Trump’s sweeping executive orders and mass pardons have shattered political and legal norms. But one order is in a category of its own.

President Trump did not place his hands on a stack of Bibles while taking the oath of office Monday, but he did not violate the U.S. Constitution either.

Theodore Roosevelt did not use a Bible when he was sworn in following the death of President William McKinley in 1901. Lyndon Johnson had his hand on a Catholic missal, or prayer book, when he took the oath aboard Air Force One after the assassination of President John F. Kennedy in 1963.

While the Constitution does not specify who must administer oaths, Chief Justice John Roberts is expected to swear in Donald Trump on Monday, continuing a two-century-old tradition.

Throughout the prior 59 presidential inauguration ceremonies there have been moments of celebration and of various mishaps.

Trump took the oath of office on Monday immediately after Vice President JD Vance was sworn in by Associate Supreme Court Justice Brett Kavanaugh. As Vance took the oath of office, he placed his right hand on a Bible that was held by his wife, Usha Vance, as she also held one of their three children.

Images from the inauguration show President Trump did not put his hand on a Bible as he was sworn in by Supreme Court Chief Justice John Roberts. It is not required in the Constitution.

He grew up in Long Beach, Indiana. As an attorney for the government and in private practice, he argued 39 cases before the US Supreme Court and won 25 of them. Chancellor of the Smithsonian Institution. Roberts is the youngest chief justice since John Marshall in 1801.

President Trump has taken the oath of office. The oath was administered by Chief Justice of the Supreme Court, John Roberts.

Justice Brett Kavanaugh will administer the oath of office to Vice President-elect JD Vance. Trump tapped Kavanaugh for the Supreme Court in 2018. Vance will be sworn in first.

Donald Trump was sworn in shortly after noon as the 47th president of the United States. Trump shook hands with members of his family shortly after Chief Justice John Roberts administered the oath. JD Vance was sworn in as vice president just moments earlier,

Mark E. Potts is the senior editor for video at the Los Angeles Times. A native of Enid, Okla., Potts graduated from the University of Oklahoma with a master’s degree in broadcast journalism. He has created and edited video for DreamWorks, YouTube, Microsoft, Sony and BET.