President Donald Trump‘s visit with Ukrainian President Volodymyr Zelensky at the White House derailed into heated outbursts on camera, endangering the Trump administration’s progress on negotiating a precursory rare earth minerals agreement and an end to the war in Ukraine.

The palpable tension, including the president yelling at Zelensky, played out before reporters brought into the Oval Office, and it resulted in the cancellation of the leaders’ scheduled joint press conference and Zelensky’s premature exit from the White House. The US-Ukraine mineral deal that prompted Friday’s visit was never signed.