Four employees of the Trump Administration's Commerce Department lost their jobs Tuesday because they couldn't pass background checks to attain permanent security clearance.

The Washington Post reported that one of the men terminated, Fred Volcansek, was not informed as to why he was being fired prior to his ouster.

"What’s interesting is that my investigation went on for 13 months,” he told the Post. “If they found something . . . why didn’t they bring it up before?"

Though there are a wide array of reasons for people being denied security clearance, among the most common, the Post's report continued, includes "withholding information from a government disclosure form, past criminal convictions, compromising contacts or being the subject of an investigation." The causes for the four staffers terminated today to be barred from permanent clearance is currently unclear.