What we know about Elon Musk’s ‘Department Of Government Efficiency’ and bromance with Donald Trump.

Donald Trump's announcement that Elon Musk and Vivek Ramaswamy will lead a newly formed Department of Government Efficiency has alarmed some government ethics experts.

Donald Trump has announced that Elon Musk and Vivek Ramaswamy, a former presidential candidate and ally of Trump, will lead a new "Department of Government Efficiency."

Several people close to Donald Trump have stressed to ABC News the significance and influence billionaire Elon Musk has had in the Trump orbit over the last week.

The president-elect returned to golf at Trump International, the same course where an assassination attempt was made against him in September.

Elon Musk joined Donald Trump's phone call with Ukrainian President Volodymyr Zelenskyy on Wednesday, multiple sources with direct knowledge of the call told ABC News.

Elon Musk, the world's wealthiest person, has campaigned in support of Trump.

Musk, the world's richest person, has sought to help elect Donald Trump.

The Philadelphia district attorney sued Elon Musk and his super PAC on Monday over the billionaire's controversial $1 million giveaway.

The Justice Department has warned Elon Musk's America PAC that his $1 million giveaway to swing-state registered voters may violate federal law, a source says.

Musk, the world's richest person, is a prominent supporter of Trump.

In a series of town halls, tech billionaire Elon Musk has sought to harness his power as an influencer to help return Donald Trump to the White House.

In a letter to the Federal Communications Commission, 100 space researchers asked for the agency to pause new satellite launches to allow for environmental review.

Elon Musk has been in regular contact with Vladimir Putin since 2022, according to an article in the Wall Street Journal on Thursday.

Local election officials have been taking to X to refute owner Elon Musk's false election claims -- but their reach pales in comparison to Musk's 200 million followers.

The giveaway seems illegal, but occupies a blurry area of law, experts told ABC News.

Businessman Mark Cuban told ABC News that with two weeks until Election Day, the vice president has momentum on her side, but that she can improve as a salesperson.

While speaking at a town hall in Pennsylvania, tech CEO and Trump supporter Elon Musk repeated false conspiracy theories claiming that voting machines rig elections.

Tesla is set to hold an event Thursday titled “We, Robot” where the company is expected to unveil a fully autonomous vehicle that CEO Elon Musk has called a “Cybercab.”

In a statement Monday, the White House decried a now-deleted post by Elon Musk on X as "irresponsible."

The United Auto Workers Union has filed federal labor charges against former President Donald Trump and Elon Musk, the union said Tuesday.

Donald Trump’s conversation with Elon Musk on X Monday night started almost an hour late as the social media platform was plagued with technical difficulties

Musk endorsed Trump last month.

Noland Arbaugh, who is paralyzed from the shoulders down, became the first human patient to receive the Neuralink device in January.

Elon Musk's Neuralink told ABC News that it is looking to implant two more participants in the coming months.

The company is one of the worst-performing stocks in the S&P 500.

The move centers on a key issue in the fight to shape AI.

Elon Musk sued OpenAI and its CEO Sam Altman on Friday alleging the ChatGPT maker abandoned its mission of benefiting humanity in a sprint toward profits.

Neuralink says its goal is to help people living with debilitating conditions, including paralysis, communicate and control external devices with their thoughts.

The move would tie the company's fate closer to its high-profile founder.

Ongoing losses could make a sale attractive for Elon Musk but obstacles to such a move remain.

The remarks follow a weekslong advertising exodus from X, formerly known as Twitter.

The Securities and Exchange Commission on Thursday sought to force Elon Musk to sit for a deposition as part of an ongoing investigation about his purchase of Twitter.

The billionaire entrepreneurs have gone back and forth on the plans for weeks.

The task of overtaking X poses a formidable challenge but Threads holds advantages, they said.

Elon Musk says Twitter has "negative cash flow" and "heavy debt" due to lack of advertisers.

Elon Musk has previously criticized the pace and ambitions of advances in AI.

The notice came after the reported resignation of two of Twitter's data security executives.

Virgin Islands subpoenas Elon Musk in lawsuit against JP Morgan

Elon Musk made the announcement in a tweet on Thursday.