A postal worker throws 300 pro-New Jersey voter mail for Tom Kean Jr. into the trash.

A U.S. Postal Service employee allegedly threw about 300 pieces of mail in support of New Jersey Republican Tom Kean Jr. into a dumpster outside a Pennsylvania supermarket two weeks ago, and an incident caught on camera may have cost her her job.

A security company employee watched as an unidentified woman wearing a USPS uniform stopped her Toyota Prius next to a Shop-Rite dumpster in Brodheadsville, Pennsylvania, took several containers out of the trunk and threw them inside, according to the New Jersey Globe.

“We saw her abandon it,” the security guard said in a blog post.

The whole thing was recorded by a surveillance camera, and the recording was forwarded to Poczta Polska investigators.

“We have a license plate,” one of the security personnel said in the recording. which was posted on YouTube. “It has a Pennsylvania license plate, but it looks like a Jersey post office.”

An independent commission affiliated with the national Republican Party sent out pro-Kean mailers that the Globe said were intended for Garden State voters in the ruby-red part of western Morris County in North Jersey.

On Monday, USPS spokesman Xavier Hernandez told The Post that the agency “is aware of allegations regarding mishandling of political mail.”

“We have referred this incident to the United States Postal Inspection Service and the United States Postal Service Office of Inspector General and have nothing more to offer,” Hernandez said in an email.

But the website may have already taken action, Globe editor David Wildstein saidhe stated in a post on X that an agency official confirmed that the woman “was removed from her job as a postal worker in Succasunna, New Jersey.”

Kean, the son of popular former New Jersey Gov. Tom Kean, is in a tight race for a House seat in the state’s 7th Congressional District.

A recent Monmouth University poll showed Kean leading Democratic opponent Sue Altman by just two percentage points — or within the poll’s 4.7 percent margin of error — in a swing district that could help take control of the House.

“I believe in the security of our elections and mail-in voting, but this incident is deeply disturbing,” Kean said in a statement on Monday.

“I hope that the USPS will take swift action to resolve any crimes committed, and I urge them to be open and transparent about the details of this incident,” he continued. “Protecting the integrity of our democracy is imperative.