In an interview with NBC News, the president also said he assumes his relationship with the tech billionaire is over after their recent falling-out.

Elon Musk and Donald Trump had a spectacular falling out which had been building as the tech billionaire attacked the US president's "big beautiful bill" for several days

The row between Elon Musk, the world's richest man, and U.S. President Donald Trump was triggered by stress on both sides and Elon made a mistake by publicly challenging Trump, Musk's father told Russian media in Moscow.