Elon Musk and Saudi prince are opponents in the fight for control of Twitter

Yesterday's friends seem to have become today's enemies.

Elon Musk, the richest man in the world, relied in 2018 on Saudi Arabia to justify his desire to take Tesla private.

"Am considering taking Tesla private at $420," the billionaire entrepreneur posted on Twitter on August 7, 2018. "Funding secured."

"Funding secured' triggered an investigation by the Securities and Exchange Commission (SEC). This investigation had led a few weeks later to a settlement including a fine of $20 million for Musk and another penalty of $20 million for Tesla  (TSLA) - Get Tesla Inc Report. The CEO had also lost his position as Chairman of the Board of Directors.