Among the remarks the agent allegedly made: Military members who donate to these groups would be subject to discipline under the Uniform Code of Military Justice, the soldier reported.

Liberty Institute has stepped in to investigate. Michael Berry, one of the nonprofit’s attorneys, said he has been advising the soldier about his options — but that in the meanwhile, he said the American public should be on guard.

“The American public should be outraged that the U.S. Army is teaching our troops that evangelical Christians and tea party members are enemies of America and that they can be punished for supporting or participating in those groups,” Mr. Berry said, in Fox News. “These statements about evangelicals being domestic enemies are a serious charge.”