While acknowledging the Postal Service’s rocky financial position, Mark Dimondstein, president of the American Postal Workers Union, sharply criticized the new measures — arguing they hit at the very core of the agency’s mission, which is to “provide prompt, reliable, and efficient service.”

“These additional moves by the new Postmaster General seem to be sending the opposite message, which is that mail can wait,” Dimondstein told Business Insider in a phone call on Tuesday. “It will likely undermine the mission we’re dedicated to. And in terms of the people of the country, it will likely lead to slower, less prompt, and less reliable, and really less efficient service.”

When asked about the memos, a spokesperson for the USPS told Business Insider that the service is “developing a business plan” to remain financially stable while providing “reliable, affordable, safe and secure delivery of mail, packages and other communications to all Americans as a vital part of the nation’s critical infrastructure.”

“While the overall plan is not yet finalized, it will certainly include new and creative ways for us to fulfill our mission, and we will focus immediately on efficiency and items that we can control, including adherence to the effective operating plans that we have developed,” the spokesperson said.