If you suspect someone has lied to immigration officials, you can report the situation to the appropriate authorities. Here are a few steps you can take:

1. Contact U.S. Citizenship and Immigration Services (USCIS): You can report suspected immigration fraud to USCIS by submitting a tip through their online tip form or by calling their hotline at 1-866-347-2423.
2. Contact the Department of Homeland Security (DHS): You can report suspected immigration fraud to DHS by contacting the DHS tip line at 1-866-DHS-2-ICE or by submitting a tip through their online tip form.
3. Contact Immigration and Customs Enforcement (ICE): You can report suspected immigration fraud to ICE by calling their hotline at 1-866-347-2423 or by submitting a tip through their online tip form.
4. Contact the Federal Trade Commission (FTC): You can report suspected immigration fraud to the FTC by submitting a complaint through their online complaint form or by calling their hotline at 1-877-382-4357.

When reporting immigration fraud, it is important to provide as much information as possible, including the name and contact information of the individual or organization suspected of fraud, the nature of the fraud, and any supporting evidence you may have. It is also important to protect your safety and privacy when making a report.