President Donald Trump's "first buddy," Elon Musk, was seemingly everywhere in D.C. on Inauguration Day. Where (and with whom) was the billionaire?

Elon Musk made a surprise appearance, accompanied by his son, in the middle of President-elect Donald Trump’s victory rally as rumors swirl of an already-fractured relationship between his Department of Government Efficiency (DOGE) counterpart,

A lawsuit will be filed against Elon Musk and Vivek Ramaswamy’s new nongovernmental entity as soon as Donald Trump is officially president.

Among the guests at Donald Trump's second inauguration in Washington, D.C. today were three billionaire tech CEOs: Amazon's Jeff Bezos, Tesla's Elon Musk, and Meta's Mark Zuckerberg. They were also joined by Google CEO Sundar Pichai and Apple CEO Tim Cook.

Walter Isaacson, who wrote an autobiography about Elon Musk, joins TODAY to talk about the billionaire businessman and what led him to embrace Donald Trump for his second run for the Oval Office. Isaacson also discusses how Musk plans to juggle his companies,