The U.S. Postal Service Office of Inspector General is conducting an investigation into reports of service disruptions and a slew of other issues, according to a spokeswoman of Senator Elizabeth Warren.

A spokeswoman of Senator Elizabeth Warren said on Friday that the U.S. Postal Service Office of Inspector General is trying to get to the bottom of service disruptions reports, as well as other concerns raised by lawmakers. Spokeswoman Saloni Sharma said they have been told that the United States Postal Service Office of the Inspector General is looking into every aspect of their request from Aug. 7.

Sharma said that as part of its investigation, the USPS has already requested documents. A spokeswoman for U.S. Postal Service Inspector General Tammy Whitcomb confirmed that the office has received the congressional request and are carrying out work to address the raised issues, but refrained from divulging more details.

The letter from several U.S. lawmakers demanded a strict audit of all operational changes that have been introduced recently in order to figure out the motive behind these changes, whether their impacts were taken into consideration before implementation, their effect on the quality of mail delivery, and its overall impact on the much-needed service for the impending election, Reuters reported.

New Postmaster General Louis DeJoy ordered operational changes along with a clampdown on overtime in an attempt to mend the financially troubled service, which saw a net loss of $2.2 billion in the last quarter. DeJoy is a Republican since 2017 and has donated $2.7 million to Donald Trump.

The lawmakers have also asked DeJoy and his wife if they have "met all ethics requirements" in terms of disclosure, divestment, and recusal from the decision in which he may have a disagreement. The recently introduced changes include orders for delivery trucks to leave on time even if mail is being loaded and reduced retail hours.

These changes have led to delays across the United States, according to workers and political leaders. The disorder comes as elections officials gearing up to send millions of ballots by mail before the Nov. 3 presidential election, amid baseless claims by Trump that mail voting could lead to voters fraud. Experts suggest mail voting is as safe and secure as any other method.

The Postal Service has warned at least five states including Washington, Missouri, California, Pennsylvania, and Michigan about voters not having enough time to complete ballots and then return them due to the new state laws.