The falling out between President Donald Trump and former Department of Government Efficiency head Elon Musk was triggered by disagreements over Trump’s “One Big Beautiful Bill.”

At a bill signing event at the White House, Trump invoked his high-profile former aide, saying "Now I know why Elon doesn't like me so much."

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