US government seeks to join Elon Musk in challenge against EU's fine on X ↧ ↧ US government seeks to join Elon Musk in challenge against EU's fin... The US government said on Thursday it had formally sought to join a legal challenge filed by billionaire Elon Musk to dismiss a fine of €120 million ($136.51 million) by the European Union against ​his social media platform X.