US House approves plan to train rebels

US lawmakers have voted to authorise training and arming of vetted Syrian rebels to combat Islamist radicals, a crucial step in President Barack Obama's bid to thwart extremism surging across Iraq and Syria.

Despite misgivings by war-weary Democrats that the move could open the door to full-blown American military intervention in the Middle East, and concern by conservatives that the plan falls short of what is needed to defeat the Islamic State (IS) group, the House of Representatives voted 273 to 156 to approve Obama's train-and-equip plan.

The measure was included as an amendment to a stop-gap federal spending measure which also easily passed the House. The overall bill now shifts to the Senate, where leaders are confident it will pass on Thursday and head to the president for his signature.

Obama has pressed Congress to provide him political cover to initiate military action in Syria against IS, although the White House and many lawmakers believe he has the constitutional authority to launch air strikes in Syria, as he has done in Iraq, to protect US national security interests.

House Speaker John Boehner hailed the vote as "an important, initial step forward in taking on the Islamic State of Iraq and the Levant (IS)".

The measure was crafted by House Armed Services Committee chairman Buck McKeon, who was among many Republicans who feel Obama's plan doesn't do enough to meet the goal of degrading and destroying IS, which has overrun large areas of Iraq and Syria.

But with Democrats largely split on the issue, the party's House number two Steny Hoyer took to the floor to rally Congress to back the commander-in-chief in a time of crisis.

"We are united in our resolve to meet this threat. We clearly may have differences on this House floor, but we are Americans when it comes to defending our people, and our country," Hoyer said.

"We know empirically the cost of doing nothing is far too great."