Republican incumbents are facing tough challenges in Maine and Nevada. In South Carolina, a crowded field of MAGA-devoted Republicans are facing off to be the next governor.

In Maine, a Senate primary shines light on a tight general election matchup while gubernatorial primaries in South Carolina and Nevada may signal the future for the Republican and Democratic parties.

NPR's Leila Fadel looks ahead to some of the day's primary elections with J. Miles Coleman of the University of Virginia's Center for Politics.

Several California races remain uncalled as millions of ballots still need to be counted. All regular occurrences -- and all fodder for President Trump's claims it's a sign of election fraud.

President Trump is casting doubt on the results of California's primaries, claiming there was voter fraud. NPR's Leila Fadel asks Attorney General Rob Bonta about the baseless claim.

A federal judge on Monday struck down the Trump administration's $100,000 fee on new H-1B visas. The administration announced the fee as a way of preventing foreign workers from taking American jobs.

Live election results: Get the latest on Nevada's gubernatorial and U.S. House primary races.

Live election results: Get the latest on Maine's U.S. Senate, U.S. House and gubernatorial primary races.

Live election results: Get the latest on South Carolina's U.S. Senate, U.S. House and gubernatorial primary races.

Live election results: Get the latest on North Dakota's U.S. House primary races.