philadelphia president donald trump elect last november republican lawmakers enthusiastically join call rewrite tax code dismantle obamacare first 100 days presidency congressional republicans gather annual policy retreat philadelphia wednesday 100-day goal morph 200 days week wear leaders say could take end 2017 possibly long passage final legislation trump different idea speak lawmakers philadelphia tell enough talk time deliver divergent view timetable among many indications tensions simmer surface three-day republican retreat cameras trump republicans seek convey image happy unify family play differences tax policy whether reinstate torture interrogation techniques investigate 2016 election fraud clearly none open warfare sometimes erupt among republicans senator ted cruz infuriate many colleagues lead standoff obamacare partially shut government 2013. barely visible philadelphia potential flashpoints disagreement within republican rank-and-file congress well republican lawmakers unorthodox new president include replace obamacare republicans succeed quest repeal revamp multi-layered tax code whether build wall u.s. border mexico nature u.s. relationship russia come tax reform senior congressional aid say spring 2018 might likely time year passage legislation republican lawmakers lavish praise trump public dozens interview many say felt would energetic champion issue care also voice fear big agenda would drive deficits say still search detail plan several republican lawmakers aid say wary cost plan build wall border mexico republican leaders say wall proposal discussion would cost 12 billion 15 billion cost congressional aid say could end easily top 20 billion republican representative hurd whose texas district partially border mexico go step call wall ineffective tool stop illegal immigration others warn border adjustment tax foreign goods pay wall could hurt u.s. company profit raise cost american consumers spark retaliation foreign trade partner lawmakers also worry constituents could risk lose healthcare coverage push repeal obamacare move quickly republican representative tom cole say rank-and-file lawmakers incentive fall line behind trump want reason successful get things do say still cole say republicans take stock potential cost big items trump agenda wall infrastructure project tax cut beef military spend think worry cole say follow trump speech lawmakers thursday senator jam risch say decisions make replacement obamacare complex law expand healthcare insurance millions americans go take resolve risch say ask reporters whether republicans clear idea trump would like replace obamacare risch respond detail no tensions simmer surface trump republicans map strategy