The bromance is over.

An extraordinary social media feud between U.S. President Donald Trump and tech billionaire Elon Musk Thursday showcased the public fracturing of their once-close relationship.

Here’s a rundown of how Trump and Musk got here:

Musk publicly endorses Trump following an assassination attempt at a campaign rally in Butler, Pennsylvania.

Musk posts on social media platform X: “I fully endorse President Trump and hope for his rapid recovery.”