The lawsuit is the fourth legal challenge against Trump's executive order on voting. The attorneys general argue the order is "an unconstitutional attempt to seize control of elections."
The 22nd Amendment bans a person from being elected U.S. president more than twice. But some legal experts point to plausible strategies that President Trump could try to serve a third term.
The order tests the power of Trump's authority and would require voters using a federal form to show proof of citizenship to register to vote in federal elections. It's sure to be tested in court.
Under the Trump administration, the Justice Department has stepped away from some voting rights lawsuits, leaving behind a gap in enforcement of protections against racial discrimination in elections.
The House has passed legislation that would make sweeping changes to voter registration, including requiring those signing up to present documents proving U.S. citizenship.
President Trump's effort to "rein in" independent agencies is raising particular concern among those who follow the work of the Federal Election Commission, which enforces campaign finance laws.
Staffers at the U.S. cybersecurity agency working on countering foreign disinformation and on election security have been put on leave, according to sources who spoke anonymously for fear of reprisal.
More than 80 days after Election Day, a race for a seat on the North Carolina Supreme Court remains unresolved. That's because the Republican candidate is contesting some 65,000 ballots.