washington republican donald trump campaign promise shake washington president brash real estate mogul position dramatically change unite state handle immigration trade range policies yet many ambitious proposals require cooperation congress likely enjoy post-election honeymoon congressional republicans long-lasting romance far guarantee give uneasy relationship congressional leaders basic ideological differences republican orthodoxy follow overview trump top domestic policy plan base sometimes vague detail agenda likelihood success campaign trump argue international trade agreements hurt u.s. workers country competitiveness promise get tough china withdraw 12-nation trans-pacific partnership tpp still finalize renegotiate scrap north american free trade agreement 1994 free-trade deal mexico canada president trump power raise tariff countries china could delay tpp well even congress approve economists warn move would damage economy force consumers pay dramatically high price everything refrigerators t-shirts u.s. export airplanes soybeans would likely suffer well campaign trail trump promise build wall along mexican border deport millions undocumented immigrants ban immigration countries compromise terrorism policies would come cheap trump estimate wall would cost billion 12 billion estimate run much high politico estimate would cost least 166 billion deport country illegally complete border wall many congressional republicans support policies might blanch cost trump say would force mexico pay wall power force another country spend money something want broadly trump could shift broad debate immigration empower skeptics like republican senator jeff sessions alabama want reduce overall immigration level reduce number skilled guest workers would blow business group hispanic advocate seek relax immigration laws trump promise repeal president barack obama signature affordable care act popularly know obamacare replace plan would give state control medicaid health plan poor allow insurers sell plan nationally would need congress act republicans could difficulty get 60 vote need advance repeal effort 100-seat senate republicans could face public backlash repeal law provide healthcare millions americans trump administration would plenty opportunities undermine obamacare however appoint officials commit success trump vow make deep tax cut also promise protect popular health retirement program account third u.s. government spend combination policies would massively increase national debt accord nonpartisan center responsible budget also propose increase spend military infrastructure say would reduce spend categories health retirement percent year tax would get plenty help republicans congress lay groundwork tax-code overhaul would low rat close loopholes encounter fierce resistance homeowners businesses interest group benefit current tax break trump promise protect entitlement program rile fiscal conservatives worry swamp federal budget decades come program popular american public trump promise dismantle 2010 dodd-frank financial reform law enact follow financial crisis give detail republican party platform call reinstate glass-steagall 1930s-era law force separation investment bank deposit-taking institutions trump former campaign manager paul manafort say july campaign back change republican lawmakers far unable undo many most-despised piece dodd-frank law many rank oppose return glass-steagall trump offer detail plan fight islamic state say would knock hell militant group say keep detail strategy secret disclose enemy trump say win would give u.s. general 30 days take office jan. 20 propose plan trump say oppose accept refugees flee violence syria instead say would create safe zone say would fund gulf state obama say safe zone syria would require large u.s. military commitment something could prove unpopular americans weary lengthy war iraq afghanistan trump say would good relationship russia trump say could work russia combat islamic state also say would look recognize crimea seize ukraine 2014 russian territory lift sanction russia impose western nations call illegal land grab trump criticize north atlantic treaty organization say u.s. ally meet defense commitments july say russia attack nato member would consider whether country pay provide defense nato leaders say sanction russia key persuade change country behavior ukraine back ethnic russian separatists alliance long focus fight international terrorism one vacancy supreme court several likely come four years trump chance put conservative stamp nation court decades come list potential nominees praise conservative activists republicans senate eager help area factbox top goals president trump hurdle front