CHICAGO (AP) — The Illinois attorney general’s office warns that with President Obama’s sweeping immigration changes comes the possibility of immigration service fraud.

Prosecutors say immigration services applicants could be targeted by scammers posing as lawyers or demanding excessive upfront fees for assistance.

Attorney General Lisa Madigan says because the immigration process is often intimidating and confusing, many people seek assistance. She says that’s why it’s important to know where to find honest assistance.

According to Madigan’s office, immigration service providers must register with the office unless they are licensed attorneys. Nonprofits recognized by the Board of Immigration Appeals can also offer services.

The immigration changes implemented by the president mostly benefit immigrants who’ve been living in the U.S. illegally for more than five years but whose children are citizens or permanent residents.