Three U.S. states are suing the Trump administration over changes to the U.S. Postal Service (USPS) ahead of the November election.
This is the latest development in a row about the federal agency, which is responsible for managing the postal ballots for voting.
The file alleges that “partisan interference” is slowing deliveries, which could “endanger” electoral plans.
Neither the White House nor the USPS have yet commented on the filing.
Democrats say the USPS chief, who was appointed by US President Donald Trump, attempted to deliberately “sabotage” the election with a series of recent reforms.
Postmaster General Louis DeJoy dismissed the allegations. The leading Republican donor told senators on Friday that all ballots would arrive on time and said reforms would be delayed until after the election.
But he oversaw the removal of mailboxes and cut overtime pay for workers.
- What is the US Postal Service talking about?
- Does postal voting in the United States lead to “huge fraud”?
An unprecedented number of US voters are expected to vote by mail this year due to the ongoing coronavirus pandemic.
Mr Trump has repeatedly said that mail-in ballots would lead to voter fraud – something experts and poll officials have rejected.
What does the trial say?
The states of Hawaii, New Jersey and New York are all plaintiffs in the lawsuit, as are the cities of San Francisco and New York.
“Thanks to a series of sweeping political changes besieged by partisan interference, the independent agency has become political football ready to undermine a federal election,” the file said.
He claims that President Trump has “repeatedly, emphatically and openly attempted to undermine postal voting efforts.”
In the meantime, officials appointed by him have “eliminated or substantially altered” the processes that kept mail delivered on time, resulting in serious delays and a massive backlog.
New York State Attorney General Letitia James tweeted about the filing of the complaint on Tuesday. “The slowdown is nothing more than a voter suppression tactic,” she wrote.
Last week, the Maryland attorney general said more than a dozen states were considering legal action against the Trump administration.
The US House of Representatives, meanwhile, passed a $ 25 billion (£ 19 billion) funding bill for the USPS ahead of the November election. The head of the Republican-led Senate, however, said the body “will absolutely not pass” the bill.
At Monday’s Republican National Convention, Mr. Trump again asserted that postal ballots can lead to fraud. In his speech, he called it “the biggest scam in the history of politics”.