A union that represents thousands of federal immigration officers is raising an alarm after the U.S. government ordered supplies to create millions of blank work permits and green cards, touching off speculation that the Obama administration may be preparing executive action on immigration.

The Associated Press reported last week that the new federal contract proposal from the Homeland Security Department would allow the government to buy enough supplies to make as many as 34 million immigrant work permits and residency cards over the next five years. The move appeared to suggest that the administration is preparing for a surge of work permit applications from illegal immigrants.

Kenneth Palinkas, the president of the National Citizenship and Immigration Services Council, said in a press release Monday that he believes the move indicates the administration is planning to enact “massive unilateral amnesty” after the midterm elections.

“…If you care about your immigration security and your neighborhood security, you must act now to ensure that Congress stops this unilateral amnesty,” he said. “Let your voice be heard and spread the word to your neighbors. We who serve in our nation’s immigration agencies are pleading for your help – don’t let this happen. Express your concern to your Senators and Congressmen before it is too late.”

The union represents 12,000 officers of U.S. Citizenship and Immigration Services, the agency responsible for processing visas and other immigration papers. Palinkas said federal immigration officers are already struggling to complete their mission, and the new contract indicates things could get worse.

“Whether it’s the failure to uphold the public charge laws, the abuse of our asylum procedures, the admission of Islamist radicals, or visas for health risks, the taxpayers are being fleeced and public safety is being endangered on a daily basis,” he said.

When asked about the contract last week, White House Press Secretary Josh Earnest said it was being blown out of proportion.

“I think those who are trying to read into those specific orders about what the president may decide are a little too cleverly trying to divine what the president’s ultimate conclusion might be,” Earnest said. “What I would caution you against is making assumptions about what will be in those announcements based on the procurement practices of the Department of Homeland Security.”

The U.S. government produces about 3 million work permits and residency identification, known as green cards, annually. The new contract for at least 5 million cards a year would provide the administration with the flexibility to issue far more work permits or green cards even if it chose not to exercise that option.

Obama announced earlier this year that if Congress didn’t pass immigration legislation, he would act on his own. After twice postponing a final decision, he said as recently as last month that he would hold off on executive actions until after November’s midterm elections.

The Associated Press contributed to this report.