Department of Homeland Security (DHS) Secretary Janet Napolitano has failed to answer questions from Congress about whether her agency is property enforcing the nation's immigration laws, four GOP lawmakers said Wednesday. 

The four Republican senators said the feared Napolitano's department was trying to conceal information from the public. 

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"Your failure to respond to our oversight request is deeply troubling, and suggests that your Department is attempting to conceal information from the American people," Sens. Jeff SessionsJefferson (Jeff) Beauregard SessionsFederal judge rules Trump defunding sanctuary cities 'unconstitutional on its face' FBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Alabama election has GOP racing against the clock MORE (R-Ala.), Chuck GrassleyCharles (Chuck) Ernest GrassleyFBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Klobuchar taking over Franken's sexual assault bill Lawyer: Kushner is 'the hero' in campaign emails regarding Russia MORE (R-Iowa), Orrin HatchOrrin Grant HatchProminent conservative passes on Utah Senate bid Republicans offer this impossible choice: Tax cuts or senior care Senate GOP running out of options to stop Moore MORE (R-Utah) and Pat RobertsCharles (Pat) Patrick RobertsSenate ethics panel resumes Menendez probe after judge declares mistrial Senate passes resolution requiring mandatory sexual harassment training Overnight Energy: Perry takes heat for sexual assault comments | Clovis withdraws nomination for USDA post | Battle lines drawn on Arctic refuge drilling | Energy regulator back to full strength MORE (R-Kan.) wrote to Napolitano on Wednesday.

"Congress and the American people have the right to a serious, prompt, and complete response to our questions."

The four senators wrote to Napolitano in August to ask a series of questions about whether DHS is properly assessing whether immigrants are likely to require government assistance. Under the Immigration and Nationality Act (INA), officials are supposed to deny U.S. entry to immigrants who are likely to need federal aid.

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They wrote their August letter after reports that the U.S. Department of Agriculture was encouraging Mexican citizens to emigrate to the U.S. and enroll in the federal food stamp program. The senators argued that this would appear to violate the INA, and said government appears to only be assessing whether immigrants will need help under the Supplemental Security Income and Temporary Assistance to Needy Families programs, not dozens of other programs like food stamps.


"We were thus shocked to discover that both the State Department and DHS exclude reliance on almost all governmental welfare programs when evaluating whether an alien is likely to become a public charge," they wrote in August.

The senators asked Napolitano to reply to their questions by Aug. 20. But with that deadline passed, they asked on Wednesday for answers by Oct. 1.

It is the second GOP letter asking for information in as many days. On Tuesday, House Republicans accused the Department of Labor of hiding information about possible job losses due to the sequester, and said Labor never answered questions they wanted answered by mid-August.

House Republicans also set an Oct. 1 deadline for answers on that issue.