One of the American men accused in Minnesota of trying to join the Islamic State group wanted to open up routes from the U.S. to Syria through Mexico, prosecutors said.

Gules Ali Omar told the ISIS members about the route so that it could be used to send members to America to carry out terrorist attacks, prosecutors alleged in a document filed this week.

The document, filed Wednesday, is one of many filed in recent weeks as prosecutors and defense attorneys argue about which evidence should be allowed at the men’s trial, which starts May 9.