House Republicans are demanding information from the Department of Homeland Security about immigrants who win access to the U.S. by falsely claiming they are asylum seekers afraid to return to their home countries.

In a letter sent Monday to Homeland Security Secretary Janet Napolitano, a copy of which was obtained by the Washington Examiner, Rep. Jason Chaffetz, a top Republican on the House Oversight and Government Reform Committee, questioned whether illegal immigrants were being instructed on how to beat the immigration system by falsely claim they are in the U.S. to seek political asylum.