Jeddah, AP—Secretary of State John Kerry signaled on Friday that the US hopes to enlist moderate Syrian opposition fighters that the Obama administration has reluctantly decided to arm and train in the battle against militant extremists in neighboring Iraq.

Obama sent Congress a 500 million US dollar request Thursday for a Pentagon-run program that would significantly expand previous covert efforts to arm rebels fighting both the Sunni extremists and forces loyal to Syrian President Bashar Assad. The move that comes amid increased US concern that the conflicts in Syria and Iraq are becoming an intertwined fight against the same Sunni extremist group.

If approved by lawmakers, the program would in effect open a second front in the fight against militants with the Islamic State of Iraq and Syria (ISIS) that is spilling over Syria’s border and threatening to overwhelm Iraq.

“Obviously, in light of what has happened in Iraq, we have even more to talk about in terms of the moderate opposition in Syria, which has the ability to be a very important player in pushing back against ISIS’s presence and to have them not just in Syria, but also in Iraq,” Kerry said at the start of a meeting with Syrian opposition leader Ahmad Al-Jarba.

Jarba thanked the Obama administration for requesting the 500 million US dollars, but said his rebels want even more foreign aid to fight two fronts: a bloody insurgency and their so-far unsuccessful effort to oust Assad.

“We still need greater assistance,” Jarba said, speaking through a translator. “We hope for greater cooperation with the US” He said General Abdullah Al-Bashir, the head of the military wing of the Syrian opposition, “is ready to cooperate with the US side.”

Jarba called the crisis that has gripped Iraq in the last month “very grave” and blamed Iraqi Prime Minister Nuri Al-Maliki for policies that he said have divided the country. Iraq is 60 percent Shi’ite, and the rest nearly evenly split between minority Sunnis and Kurds. Iraqi Sunnis, who enjoyed far greater privileges during Saddam Hussein’s regime, have decried Maliki’s leadership and accused him of sidelining minority groups from power.

“The borders between Iraq and Syria are practically open,” Jarba told Kerry. ISIS seized a key border crossing between Iraq and Syria in the last week.

Kerry traveled through the Mideast over the last week to try to broker a political agreement with Iraqi leaders to give more authority to Sunnis in hopes of easing sectarian tensions and, in turn, help quell the dominantly Sunni insurgency.

Kerry also met with King Abdullah of Saudi Arabia, where it was expected he would seek Saudi Arabia’s help in supporting Sunni efforts to combat the Sunni insurgency. More than 90 percent of Saudi Arabians are Sunni Muslims.

Obama has long been reluctant to arm the Syrian opposition, in part because of concerns that weapons may fall into extremist hands, a risk that appears to have only heightened now that ISIS has strengthened. But Obama’s request to Congress appeared to indicate that tackling the crumbling security situation in Syria and Iraq trumped those concerns.

White House spokeswoman Caitlin Hayden said the military assistance “marks another step toward helping the Syrian people defend themselves against regime attacks, push back against the growing number of extremists like ISIS who find safe haven in the chaos, and take their future into their own hands by enhancing security and stability at local levels.”

The Syria program is part of a broader request of 65.8 billion US dollars that the administration sent to Capitol Hill on Thursday. The package includes 1 billion US dollars to help stabilize nations bordering Syria that are struggling with the effects of the civil war. It also formalizes a request for a previously announced 1 billion US dollars to strengthen the US military presence in Central and Eastern Europe amid Russia’s threatening moves in Ukraine.

With ISIS gaining strength, US officials say Assad’s forces launched airstrikes on extremist targets inside Iraq on Monday. The US is also weighing targeted strikes against ISIS in Iraq, creating an odd alignment with one of Washington’s biggest foes.

Obama has ruled out sending US troops back into combat in Iraq. But he has dispatched nearly 600 US forces in and around Iraq to train local forces and secure the American Embassy in Baghdad and other US interests.

The White House has been hinting for weeks that Obama was preparing to step up assistance to the Syrian rebels. In a commencement speech at West Point on May 28, he said that by helping those fighting for a free Syria, “we also push back against the growing number of extremists who find safe haven in the chaos.”

Officials said the administration would coordinate with Congress and regional players on the specific types of training and assistance the US would provide the opposition. One potential option would be to base US personnel in Jordan and conduct the training there.

The Senate Armed Services Committee already has approved a version of the sweeping defense policy bill authorizing the Defense Department to provide “equipment, supplies, training and defense services” to elements of the Syrian opposition that have been screened. The Senate could act on the bill before its August recess.

In addition to the covert train-and-equip mission, the US also has provided nearly 287 million US dollars in nonlethal assistance to the moderate opposition.

The military program would be supplemented by 1 billion US dollars in assistance to Syria’s neighbors—Jordan, Lebanon, Turkey and Iraq—to help them deal with an influx of refugees and the threat of extremists spilling over their borders.