Elon Musk reached out and talked privately to President Donald Trump before the billionaire entrepreneur apologized for his harsh personal attacks.

Elon Musk called President Donald Trump on Monday night, two sources familiar with the conversation told ABC News.

JD Vance and Susie Wiles pushed Elon Musk to repair his relationship with President Trump after the tech billionaire blew up at the president in a dramatic and public falling out, according to people familiar with the matter. In a call last Friday, the vice president and the White House chief of staff urged Musk to put an end to the feud.

"Shame on those who voted for it: you know you did wrong," the Tesla CEO wrote, citing projections that the legislation would add more than $2 trillion to the national debt.

The Tesla CEO's quick reversal after his blow-up with the president communicates quite a lot, one expert in political science says.