washington republican presidential front-runner donald trump say tuesday unite state use waterboarding harsh interrogation techniques question terror suspect renew call tough u.s. border security attack brussels billionaire businessman say authorities able whatever gain information effort thwart future attack waterboarding would fine expand laws would lot waterboarding trump say nbc today program add believe torture could produce useful lead get information people waterboarding practice pour water someone face simulate drown interrogation tactic ban president barack obama days take office 2009. critics call torture trump main republican rival u.s. senator ted cruz texas suggest heighten police scrutiny neighborhoods large muslim populations need empower law enforcement patrol secure muslim neighborhoods become radicalize say statement trump also call increase law enforcement surveillance mosques unite state need surveillance deal mosques whether like trump tell fox business network attack ... do swedish people tell you islamic state claim responsibility tuesday suicide bomb attack brussels airport rush-hour metro train belgian capital kill least 30 people trump call temporary ban muslims enter country urge tough measure stop flow illegal immigrants particularly syrian refugees america president ... would tough border would allow certain people come country without absolute perfect documentation say trump campaign become republican nominee nov. election decide obama successor brussels attack bring national security back top presidential election agenda possibly sharpen division trump isolationist approach foreign policy republican rival traditional interventionist outlook monday trump express skepticism u.s. role north atlantic treaty organization say unite state significantly cut spend defense alliance cruz criticize trump nato proposal way respond terrorist attack weakness unilateral preemptive surrender abandon europe withdraw nato trump suggest preemptive surrender cruz tell reporters washington early attack paris san bernardino california push security issue forefront white house campaign debate 130 people kill paris november threat terrorism jump fifth first reuters/ipsos poll list country important problems remain economy move back top list mid-january democratic presidential front-runner hillary clinton say u.s. military leaders find techniques like waterboarding effective get work consistent value say nbc add officials need resort torture go need help clinton democratic rival u.s. senator bernie sanders vermont back strong intelligence-sharing monitor social media fight islamist militants oppose bolster surveillance muslim communities would unconstitutional would wrong fight terrorist organization barbaric organization kill innocent people fight religion sanders tell reporters walid phares name trump week one foreign policy experts tell reuters brussels attack would force europe unite state reassess counter-terrorism strategies identify radicalize elements also type protection soft target need trump look take another step toward win republican presidential nomination contest arizona utah tuesday aim deal another setback party establishment flag stop-trump movement big lead convention delegate pick republican nominee defy weeks attack members party establishment worry lead republicans defeat november arizona one u.s. state border mexico trump hardline immigration message popular lead poll utah trump lag poll behind cruz addition temporary ban muslims enter country trump call build wall u.s.-mexican border halt illegal immigration trump back waterboarding lot brussels attack