washington pakistan foreign minister thursday describe hollow allegations comment senior u.s. officials lawmakers visit washington week question islamabad resolve fight militancy president donald trump administration seek implement regional strategy u.s. officials long critical role pakistan play afghanistan senior officials point recent days islamabad allege support militant group early week u.s. defense secretary jim mattis say unite state would try one time work pakistan afghanistan trump would take whatever step necessary change pakistan behavior tuesday top u.s. military officer say believe pakistan main spy agency inter-services intelligence isi directorate tie militant group want us sniff want us take action whatever action propose ... hollow allegations acceptable pakistan foreign minister khawaja asif tell group reporters august trump outline new strategy war afghanistan chastise pakistan allege support afghan militants reuters first report possible trump administration responses discuss include expand u.s. drone strike perhaps eventually downgrade pakistan status major non-nato ally asif single senator john mccain chairman senate arm service committee say senator play constituents criticize pakistan say saint perhaps past make mistake since last three four years wholeheartedly single mindedly target terrorists asif say asif say pakistan less influence taliban previous years could impact efforts peace talk bring end war afghanistan add u.s. secretary state rex tillerson would visit pakistan late month pakistan 's top diplomat push back u.s. claim militant support