U.S. President Donald Trump expressed strong disappointment Thursday over Elon Musk’s criticism of his major policy bill, admitting uncertainty about the future of their friendship. In a striking outburst from the Oval Office, with visiting German Chancellor Friedrich Merz silently seated beside him, Trump launched into a tirade against Musk, the CEO of SpaceX and Tesla — marking his first public remarks on the controversy. “Look, Elon and I had a great relationship. I don’t know if we will anymore. I was surprised,” Trump told reporters in the Oval Office after former advisor Musk slammed the bill as an “abomination”. “I’m very disappointed, because Elon knew the inner workings of this bill better than almost anybody sitting here… All of a sudden, he had a problem,” Trump added. Musk hit back minutes later on his X social network, saying the 78-year-old president’s claims he had advance sight of the bill were “false.” “Whatever,” he added above a video of Trump saying Musk was upset about the loss of subsidies for electric vehicles. The latest clash comes less than a week since Trump held a grand Oval Office farewell for Musk as he wrapped up his time leading the cost-cutting Department of Government Efficiency (DOGE). Musk stunned reporters at the time by turning up with a black eye that he said was caused by his son. “You saw a man who was very happy when he stood behind the Oval desk, and even with the black eye. I said, you want a little makeup? We’ll get you a little makeup,” Trump said. “But he said, ‘No, I don’t think so,’ which is interesting and very nice. He wants to be who he is.” Trump said he could understand why Musk was upset with some steps he had taken, including withdrawing a nominee to lead the NASA space agency whom the tech tycoon had backed. The US president’s “big, beautiful bill” on tax and spending — the centerpiece of his domestic agenda — could define his second term and make or break Republican prospects in the 2026 midterm elections. Musk however called it a “disgusting abomination” on Tuesday. A day later, the magnate called for Republicans to “kill the bill,” and for an alternative plan that “doesn’t massively grow the deficit.”