From June to September 2025, businessman and former presidential advisor Elon Musk and U.S. president Donald Trump engaged in a series of social media attacks, primarily across X (formerly Twitter) and Truth Social, following Musk's exit from the second Trump administration with his criticisms of the One Big Beautiful Bill Act, a bill intended to be landmark legislation for Trump.

Prior to being political allies in 2024, Musk and Trump shared a history of mutual provocation. In 2022, Musk described Trump as an unsuitable president due to his age in response to Trump calling him a "bullshit artist". While the relations between the two had warmed, in July 2025 however, Trump escalated the feud, stating at a rally in Michigan, "Maybe it's time he went back to where he came from". After their public feud began to thaw, with Musk sharing Trump posts on his X account and Trump calling him a good person, the two men publicly reunited at Charlie Kirk's memorial service in September 2025.

In July 2022, Trump referred to Musk as a "bullshit artist" and called Musk's contract with Twitter "rotten". Musk responded by describing Trump as being too old for the presidency, instead favoring Ron DeSantis for the 2024 presidential election. Afterwards, Trump stated on Truth Social that Musk had come to the White House requesting help with subsidized projects and that had he been asked to beg, "he would have done it". Trump also said on Truth Social that "Now Elon should focus on getting himself out of the Twitter mess because he could owe $44 billion for something that's perhaps worthless. Also, lots of competition for electric cars!".

Cash crunched by more than $50 million in legal fees, the Trump campaign met with Musk and other donors in March 2024; Musk said that he was "leaning away" from Biden. Trump declared having helped Musk in the past. Musk created the America Super PAC on May 22. Musk publicly endorsed Trump after the July 13 Butler assassination attempt. Musk hosted an X live stream on August 12 with Trump, in which he floated the idea of a "government efficiency commission". Musk ended up contributing over US$290 million to Trump's presidential campaign.

In the second Trump administration, Musk led the Department of Government Efficiency (DOGE) in an effort to slash regulations, cut expenditures, and restructure federal agencies. He served as a special government employee, limiting his tenure to 130 days.

Musk played a prominent role in campaigning during the 2025 Wisconsin Supreme Court election, spending at least US$23 million through political action committees. His role in the election was a political liability for Brad Schimel. CBS News observed that Trump stopped posting about Musk by April, when he posted about six times a week before.

Musk told investors in the April 22 Tesla earnings call that he would spend less time on DOGE going forward. During an interview at the 2025 Qatar Economic Forum on May 20, Musk told that he would scale back political spending.

Trump celebrated Musk in an Oval Office farewell ceremony on May 30. The New York Times reported that, immediately after reporters left, Trump confronted Musk over political donations made to Democrats by Jared Isaacman, a Musk ally who was Trump's nominee administrator of NASA. Trump informed Isaacman hours later that his nomination was being withdrawn.