washington top democrat u.s. senate call president donald trump tuesday block chinese investments unite state pressure china help rein north korea threaten destabilize behavior letter trump senate democratic leader chuck schumer urge use authority committee foreign investment unite state cfius pressure beijing suspend approval mergers acquisitions u.s. chinese entities schumer request come amid concern north korea fire missile friday experts say capable hit los angeles trump repeatedly urge china rein ally north korea schumer agree assessment china deter north korea unless unite state exact great economic pressure china schumer write trump republican u.s. must send clear message china government senator john cornyn republican senate intelligence committee unconvinced cfius right tool specifically purpose cfius cfius national security vehicle try make sure high-tech investments foreign countries steal cutting-edge technology cornyn say outside senate office happy work senator schumer figure concern add cornyn urge change cfius china worry however north korea china would close technology gap u.s. chinese militaries lead u.s. department treasury cfius review foreign acquisitions u.s. company national security ground take action refer case president interview reuters friday top u.s. counter-intelligence official suggest trump administration already work plan toughen cfius make significant progress work side pennsylvania avenue say william evanina national counterintelligence executive refer white house congress think go look lot different now evanina whose office oversee u.s. government efforts counter spy industrial espionage decline specific note china direct investment unite state quadruple 2015 2016 48 billion annually china un ambassador hand say washington pyongyang work toward talk north korea weapons program unite state north korea hold primary responsibility keep things move start move right direction china china u.n. ambassador liu jieyi tell reporters monday matter capable china china efforts yield practical result china worry north korea nuclear missile program u.s. reaction override concern u.s. officials say avoid north korean collapse could send millions refugees flee toward china lead reunify korea ally washington schumer plan prohibit cfius approve chinese deal would technically legal would stretch cfius mandate cfius experts say sound like effectively bar chinese investment suggest probably legal quite different case-by-case process cfius use past say stephen heifetz law firm steptoe johnson llp represent clients cfius u.s. government consider potential chinese response task force year face could well record number deal many controversial chinese firm scout u.s. target vary hotels film studios hedge weak yuan cny= top senate democrat urge trump block china deal north korea