Elon Musk denied leading a "hostile takeover" of the US government and defended his cost-cutting plans as he made a surprise first appearance at the White House on Tuesday.
The world's richest man took questions from reporters in the Oval Office as he stood next to President Donald Trump, who has tasked him with slashing the size and spending of the federal government.
Trump then signed an order giving Musk's Department of Government Efficiency (Doge) more authority to cut the federal workforce. It instructed the heads of government agencies to comply with Doge.
The agency has been criticised by Democrats who have accused it of a lack of transparency, and its efforts have also been hampered by legal challenges.