Indiana Sen. Joe Donnelly says Syrian opposition leaders he met with last week told him they don’t want American troops involved in their civil war against President Bashar Assad’s forces.

The Democratic senator spoke with reporters after his weeklong trip with other senators that included a stop at Syrian refugee camps in Turkey and visits with Indiana National Guard units in Afghanistan and Pakistan.

Donnelly says the rebel leaders told him they need assistance from the U.S. and other countries. Donnelly says he’s worried about reports that al-Qaida-affiliated groups are fighting to gain access to Syria’s chemical weapons, but that he doesn’t support sending American troops into the country.

Donnelly is a member of the Senate Armed Services Committee.