detroit former u.s. presidential candidate mitt romney attack 2016 republican front-runner donald trump fraud thursday urge primary voters keep outspoken new york billionaire get nomination pave way possible horse trade party convention july unusually harsh speech party elder romney warn former reality tv star trump would likely lose possible democratic candidate hillary clinton nov. election become republican nominee trump rise split republican party mainstream figure like romney trump supporters complain party reflect concern illegal immigration slow economic recovery see america diminish role world split widen romney party nominee 2012 urge republican primary voters vote tactically different state back trump opponents block path nomination know donald trump phony fraud say romney 68 endorse candidate would vote marco rubio florida john kasich ohio ted cruz whichever one two contenders best chance beat mr. trump give state say rubio u.s. senator florida kasich ohio governor call target vote romney set possibility contest convention republicans gather cleveland mid-july select nominee november election succeed democratic president barack obama could create pathway deny trump 1,237 delegate need nomination last republican convention go beyond one ballot 1948 thomas dewey nominate think governor realistic things stand advocate potential strategy could stop trump nomination say former romney spokesman ryan williams republican strategist scott reed say doubt last-ditch tactical vote suggestion would work one play target vote game much anger distrust reed say trump 69 make party establishment uneasy abrasive tone policy position include plan build wall u.s.-mexican border deport 11 million illegal immigrants temporarily bar muslims enter country 90 republican national security leaders sign scathing open letter oppose trump stance many foreign policy issue romney speech utah spearhead mainstream republican attempt rein trump state week republican super tuesday nominate contest take step toward earn nomination address come hours trump rival share stage detroit p.m. est debate host fox news trump lead many poll primaries remain state include major ones like florida march 15 dampen prospect derail party establishment strategy risk backfire energize trump supporters many white blue-collar voters romney talk like four years ago obama ... trump conservative political commentator michelle malkin say twitter freak late freak lame trump dismiss former massachusetts governor lose obama four years ago mitt fail candidate fail fail horribly fail badly trump tell rally maine romney decide give speech write romney say trump economic policy would sink america prolong recession mock trump ego call con man business genius romney say david axelrod former senior adviser obama call romney speech break glass moment see since 1964 republicans abandon candidate barry goldwater axelrod note thousands republicans already vote trump primary elections wonder tactic call fool axelrod write twitter additional report doina chiacu eric beech warren strobel jonathan landay matt spetalnick washington write steve holland roberta rampton edit alistair bell peter cooney article fund part sap independently create reuters editorial staff sap editorial involvement creation production republican romney call trump fraud create pathway contest convention