Many expected Elon Musk to react with outrage about Donald Trump's indictment, even to add his voice to the millions of supporters of the former president.

Those supporters consider the charges a political attack by the Democrats, intended to weaken the leading Republican candidate for president.

But to everyone's surprise, Musk, the CEO of Tesla  (TSLA) - Get Free Report and the richest man in the U.S., who has been voting Republican since last year, remained measured. 

Apart from a few words of humor in response to statements by Twitter users, the billionaire has said little about the legal setbacks of Trump, who on April 4 became the first U.S. president to be indicted in court.

In the days leading up to the indictment, Musk had made his strongest declaration on the matter. He had warned, in mid-March, that an indictment of Trump would have huge political consequences for the race for the White House.