New Delhi, July 26 -- President Donald Trump took to social media Thursday morning to support Elon Musk's car company, a startling development given their bitter public feud.

"I want Elon, and all businesses within our Country, to THRIVE," Trump wrote on Truth Social.

Late Wednesday, Tesla said revenue fell 12% and profit dropped 16% in the April-June quarter. Many prospective buyers have been turned off by Musk's foray into right-wing politics, and the competition has ramped up in key markets such as Europe and China.

Investors have been unnerved by Musk's social media spat with the president because Trump has threatened to retaliate by ending government contracts and breaks for Musk's various businesses, including Tesla.

But Trump s...