Justice department had ordered state to segregate and not count 20,000 ballots from people it claims are non-citizens

• US midterms – live updates

The supreme court on Monday ruled against the Trump administration and its attempts to force California election officials to segregate and not count ballots from people that the justice department claims are non-citizens. The ruling follows several lower courts siding with California officials, who argued the federal government was seeking to interfere in state elections.

The court did not issue an explanation for its ruling, which is customary in cases that come to it on an emergency basis. There were no noted dissents from the justices.

The tech mogul’s midterm donations backing Republicans have made him the largest single-cycle political donor in modern US history

Elon Musk has poured so much money into US politics this midterms election cycle that his donations could fund half a dozen SpaceX rocket launches or buy thousands of Tesla Cybertrucks. At the Tesla Diner in Los Angeles, Musk could order more than 31.9m cheeseburgers with the money he has spent on the midterms.

Musk, the world’s richest person, has funnelled at least $445.77m into Republican-aligned political action committees (Pacs) and groups since last year, according to US Federal Election Commission data as of 29 October. The contributions have made him the Republicans’ most prominent financial backer and the largest single-cycle political donor in modern US history.