John Boehner: Republicans doubt Obama's plan can destroy Islamic State
Speaker of the House John Boehner in Washington, DC on July 9, 2014 (AFP Photo/Jim Watson)

U.S. House Speaker John Boehner said on Thursday Republican lawmakers have doubts about whether President Barack Obama's plan can accomplish the mission of destroying Islamic State.

Boehner said no decision has been made on a legislative vehicle to authorize of Obama's request to arm moderate Syrian rebels and said discussions would continue over weekend.

"I am not sure we are doing all that we can to defeat this terrorist threat," he said.

(Reporting by David Lawder and Amanda Becker; Writing by Doina Chiacu; Editing by Bill Trott)