President Donald Trump and billionaire Elon Musk reunited at Charlie Kirk's funeral on Sunday months after their messy public feud.

The billionaire Tesla founder shook hands with the commander-in-chief in his box inside the State Farm Arena in Glendale, Arizona, as more than 60,000 mourners said goodbye to the conservative influencer.

Trump and Musk spoke for a brief moment before Trump appeared to motion him away.

Lip reader Nicola Hickling revealed Trump said 'how are you doing' as he turned to Musk to greet him.

Musk then appeared to shrug as Trump says: 'So Elon, I've heard you wanted to chat.'