Trump inauguration live updates: Highlights from Trump's inaugural speech and swearing in

Among the first executive orders set to be signed by President-elect Donald Trump will be an order to rename the Gulf of Mexico as the "Gulf of America."

During his January press conference at Mar-A-Lago, Trump declared he would change the name, saying it's currently run by cartels and that "it's ours."

"We're going to be changing the name of the Gulf of Mexico to the Gulf of America, which has a beautiful ring that covers a lot of territory, the Gulf of America," Trump said. "What a beautiful name. And it's appropriate. It's appropriate. And Mexico has to stop allowing millions of people to pour into our country."

Presidents have the authority to rename geographic regions and features via executive order.

-ABC News' John Santucci and Kelsey Walsh

Vice President Kamala Harris and second gentleman Doug Emhoff have arrived at the White House.

They exchanged handshakes with President Joe Biden and first lady Jill Biden.

The Trumps will soon join Biden at the White House for tea. They have just exited St. John's Episcopal Church.

Meta CEO Mark Zuckerberg, Amazon CEO Jeff Bezos and Tesla CEO Elon Musk are all in St. John's with the president-elect.

Their attendance was confirmed by reporters inside the church as well as a photo tweeted by Rep. Mike Waltz.

Former British Prime Minister Boris Johnson is also attending the service.

Donald Trump and Melania Trump have arrived for a church service at St. John's in Washington, a tradition for presidential inaugurations.