washington donald trump propose tuesday force mexico pay plan border wall threaten block remittances illegal immigrants say amount welfare poor families mexico government provide republican presidential candidate campaign say memo elect november trump would use u.s. anti-terrorism law cut money transfer unless mexico make one-time payment billion 10 billion wall trump pledge build wall much-touted highlight platform target illegal immigration unite state help make front-runner republican nominee nov. election unclear much wall along nearly 2,000-mile 3,200-km u.s.-mexico border would cost mexico adamant would pay memo elaborate idea trump float august suggest seize remittances tie illegal wag say upon take office trump administration would propose rule mandate company western union co wu.n require customers prove legally unite state mexico agree fund wall trump would drop propose rule say easy decision mexico campaign say add country receive 24 billion year remittances mexicans unite state country illegally remittances serve de facto welfare poor families mexico significant social safety net provide state mexico say accord world bank remittances project flow u.s. mexico 2014 last full year data nearly 24 billion although unclear portion come mexicans live country illegally democratic president barack obama call remittance-blocking idea impractical possibly self-defeating notion go track every western union bite money send mexico know good luck tell reporters mexico economy collapse would drive immigrants unite state obama add mexican president enrique pena nieto appear dismiss proposal campaign rhetoric mexican presidency comment opinion make heat electoral process choose candidates u.s. presidency president office say text message reuters move target payments send home people live unite state could crush financial effect mexico lead recipient u.s. remittances trump proposal could also affect bank company handle wire transfer also include moneygram international inc mgi.o paypal hold inc pypl.o xoom company respond request comment addition wall proposal trump accuse mexico send rapists drug runners unite state democrats many republicans repeatedly condemn comment inflammatory remark enthusiastically receive supporters especially white working-class voters memo first report washington post trump campaign repeat pledge target visa also cite impose trade tariff enforce exist trade rule way force mexico pay trump supporter benjamin proto connecticut lawyer acknowledge remittance plan unrealistic praise candidate look different ways things memo emerge republican candidate ted cruz appear set beat trump wisconsin primary contest tuesday win would hope would mark best alternative new york billionaire trump would try squeeze mexico fund border wall