The Environmental Protection Agency acknowledged Tuesday that it released personal information on potentially thousands of farmers and ranchers to environmental groups, following concerns from congressional Republicans and agriculture groups that the release could endanger their safety.

According to a document obtained by FoxNews.com, the EPA said “some of the personal information that could have been protected … was released." Though the EPA has already sent out the documents, the agency now says it has since redacted sensitive details and asked the environmental groups to “return the information.”

(See related EPA loves privacy rights, at least its own)

But Sen. John Thune, who originally complained about the release, slammed the EPA for trying to retroactively recover the sensitive data.

"It is inexcusable for the EPA to release the personal information of American families and then call for it back, knowing full well that the erroneously released information will never be fully returned," he said in a statement to FoxNews.com.

For more: EPA acknowledges releasing personal details on farmers, senator slams agency

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