washington chairman house representatives arm service committee call obama administration monday ask congress money fund plan iraq afghanistan amid expectations defense budget battle lawmakers return washington fall administration need come supplemental budget request republican representative mac thornberry say roundtable discussion reporters shortly return trip iraq afghanistan say u.s. ally force make progress afghanistan fight islamic state militants iraq stiff challenge remain campaign thornberry congressional republicans say president barack obama must formally request additional fund fiscal year start oct. since announce plan early month send troop iraq keep afghanistan expect request troop without plan pay add another wrinkle simmer dispute republican-led congress democratic administration spend obama threaten veto 602 billion defense policy bill use special fund war afghanistan iraq avoid mandatory budget limit democrats say department defense subject spend restrictions non-military program republicans accuse democrats stint national security order fund pet domestic project hold military hostage thornberry say congressman say official number pentagon tell face roughly billion expense administration make budget request early year say military commanders afghanistan grapple handle obama plan reduce number troop afghanistan 8,448 december 31 9,800 currently look use contractors whether function move afghanistan thornberry say defense secretary ash carter say pentagon evaluate proceed compare estimate cost already budget u.s. lawmaker want new budget request iraq afghanistan troop