WASHINGTON—This is exactly what President Trump and his advisers were trying to avoid. Just six days ago, senior Trump aides swallowed their irritation with Elon Musk and planned a chummy Oval Office send-off for him.

The US president says Musk has been "very disrespectful" and he has no interest in mending ties with the tech billionaire.

Elon Musk’s once-rosy relationship with President Donald Trump has turned sour in a high-profile political and financial feud that has played out publicly on social media. The fallout began after Musk stepped up his attacks on the sweeping tax and spending bill the president wants to see pushed through Congress,