Iran has blamed Jundallah for carrying out deadly bombings, abductions and targetedkillings in the southeastern Sistan-Balochistan province, which borders Pakistan.
With international combat forces set to withdraw by the end of next year, such attacks are now used more for targetedkillings and less for supporting ground troops.
Members of the House and Senate intelligence panels will be able to review the classified opinion explaining the administration's legal justification for the targetedkillings of U.S. terror suspects abroad.
Egypt has reportedly drawn up a proposal for the Palestinian groups to promise to stop attacks in return for demanding that Israel halts its "targeted killings" of suspected militants and attacks on their homes.
Meanwhile, some Democrats have expressed concern over the government's use of unmanned drones to carry out "targeted killings", and have suggested a vote on Mr Brennan should be delayed until the committee can review certain secret documents relating to the programme.