Several US states say they are considering suing the administration of President Donald Trump over the changes at the United States Postal Service (USPS).
The states say they aim to prevent new operational changes that would slow mail service in the run-up to the presidential election, which will rely heavily on mail-in voting.
A source familiar with the matter has confirmed that Massachusetts Attorney General Maura Healey is coordinating with other attorneys general to work out next steps, including possible legal action.
"We will not be deterred by Donald Trump's blatant attempts to undermine the integrity of our elections. We are exploring all options available to ensure everyone's vote is counted," Healey told CNN in a statement on Sunday.
According to a report by The Washington Post, attorneys general from Virginia, Pennsylvania, Minnesota, Massachusetts, Washington state and North Carolina, among others, are considering suing the Trump administration.
"Attorney General (Gurbir) Grewal is deeply concerned by recent reports of potential political interference in the operations of the US Postal Service. As is our standard practice, we are neither going to confirm nor deny a grand jury investigation," New Jersey's Office of the Attorney General told CNN in a statement.
Also, Colorado Secretary of State Jena Griswold has said, "We're considering all options, including legal options against the President and the postmaster general."
"There are a lot of barriers being put up from the administration -- whether that's trying to force Americans to risk their very lives to cast a ballot, to meddling with the Post Office, sabotaging the way we deliver mail, to falsehoods and lies about vote by mail," Griswold told CNN's Anderson Cooper on Friday.
Changes at the Postal Service have prompted anger among Democrats and alarm about possible impact on the 2020 election.
On Sunday, US House Speaker Nancy Pelosi recalled lawmakers from a summer recess to address those changes.
In a letter to lawmakers, Pelosi said the House would vote on legislation to forbid the Postal Service to implement any changes to services it had in place on Jan. 1, 2020.
On Friday, Pelosi and Senate Democratic Leader Chuck Schumer said, “The President, his cronies and Republicans in Congress continue to wage their all-out assault on the Postal Service and its role in ensuring the integrity of the 2020 election”.