washington republican chairman house representatives arm service committee say monday president barack obama must ask congress additional fund pay deployment troop iraq congress white house debate defense spend amid mandatory budget cut add president afghanistan announcement last week unite state deploy thousands troop budget president budget request representative mac thornberry say statement deployments fully support supplemental budget request thornberry say u.s. defense secretary ash carter announce monday washington would send 560 additional troop assist iraqi force expect push islamic state stronghold mosul obama say july would keep 8,400 troop afghanistan end presidency january republican-led congress democratic administration grapple spend obama threaten veto 602 billion defense policy bill use special fund war afghanistan iraq avoid mandatory spend limit democrats say department defense subject spend restrictions non-military program republicans accuse democrats stint national security order fund pet project obama must make new budget request iraq troop thornberry