Elon Musk’s decision to go all in on Donald Trump never made much sense. His scorched-earth approach to breaking up with Trump is even harder to square.

A breakdown in relations between President Trump and Elon Musk slammed Tesla stock Thursday, along with assets associated with the U.S. leader. Tesla shares regained some ground early Friday. Shares of Musk’s electric-vehicle maker rose around 4% in morning trading.

Musk attacked Trump directly over his signature spending bill for the first time Thursday, sparking an explosive back-and-forth.