Elon Musk, the world's richest man, is to spend election night with Donald Trump in Florida at his Mar-a-Lago resort, he said on X/Twitter.
Mr Musk, the owner of Tesla and X, has been aggressively campaigning for the Republican candidate in swing states across the country.
Trump's campaign is hosting watch parties including at his Mar-a-Lago home and also Palm Beach Convention Center for thousands of supporters.
The tech billionaire has emerged as one of the most important backers of Trump and donated more than $119m (£91.6m) this election cycle to America PAC - a political action committee he created to support the former president.