new york u.s. senator bernie sanders set throw support behind fellow democrat hillary clinton bid white house tuesday boost former secretary state prepare face republican rival donald trump nov. presidential election endorsement sanders would end bitterly fight battle democratic nomination split party education healthcare climate change come clinton offer sanders handful policy concessions issue recent weeks rally new hampshire tuesday pair appear together discuss share commitment build america strong together economy work everyone top accord statements release monday campaign sanders campaign manager jeff weaver would confirm whether sanders would formally endorse clinton tuesday say rally first many sanders stump democratic nominee sanders pressure weeks democratic party officials throw weight behind clinton lock require number delegate last month string win state-by-state primary contest resist cite policy differences clinton need sanders supporters boost chance trump run white house 40 percent sanders supporters say would vote accord recent reuters/ipsos poll weaver say despite sanders back clinton would likely still press efforts reform democratic party nominate process contentious primary season push open primaries independent voters change roles superdelegates party stalwarts support nominee choose regardless people vote district past weeks camp regular contact bring clinton close sanders progressive stances issue like wealth inequality trade healthcare education environment effort unify party sanders supporters fully satisfy clinton concessions party platform center education healthcare suggest may room friction democratic national convention late month clinton set formally nominate platform clearly influence bernie sanders say jam zogby president arab american institute sanders appointee party platform draft committee add several areas clinton campaign lose opportunity reach sanders base also make dramatic statement american people general would go long way help demonstrate different kind candidate say example say party could use strong language policy platform draft condemn trans-pacific partnership trade agreement sanders argue would hurt american workers clinton also vocally oppose sanders challenge clinton one best-known figure u.s. politics last far long expect run four months across 50 state yield record number small donations campaign previously vow help clinton defeat trump reluctant end campaign come short make formal endorsement even prominent democrats rally around include president barack obama vice president joe biden u.s. senator elizabeth warren favorite party liberal wing monday communications workers america endorse clinton early endorse sanders sanders could endorse clinton 's white house bid divisions linger