U.S. senators called on Congress on Tuesday to take back its authority to determine whether the country goes to war, saying recent U.S. strikes in Syria were not covered by existing authorizations for the use of military force.

The Senate Foreign Relations Committee has begun considering legislation that would cover military action in Syria, Afghanistan, Iraq, Somalia, Libya and Yemen against the Islamic State, al Qaeda and other Islamist militant groups.

“I have always believed that it’s important for Congress to exercise its constitutional role to authorize the use of force,” the committee’s chairman, Republican Senator Bob Corker, told a hearing on Tuesday.

As President Donald Trump has ordered stepped-up military activity in Syria, Afghanistan and elsewhere, members of Congress also want Trump to present a strategy for defeating Islamic State and other militant groups.