washington u.s. democratic presidential hopeful bernie sanders say friday would vote hillary clinton stop republican donald trump win white house lukewarm show support campaign say formal endorsement sanders comment come weeks pressure democratic party officials throw weight behind clinton presumptive nominee lock require number delegate month string win state-by-state primary contest clinton former u.s. secretary state senator first lady need sanders supporters boost chance trump nov. election 40 percent say would vote rest undecided divide trump third-party candidate stay home accord reuters/ipsos poll ask would vote clinton november sanders u.s. senator vermont tell msnbc television yes issue right go everything defeat donald trump think trump many ways would disaster country elect president need president whose cornerstone campaign bigotry insult mexicans latinos muslims women believe reality climate change continue spokeswoman sanders say comment msnbc amount endorsement clinton add senator sanders also still active candidate trump anger minority group hard line immigration include call temporarily ban muslims enter country deport millions undocumented immigrants build wall along u.s.-mexican border elect spokeswoman trump campaign immediately respond request comment wealthy new york businessman reject accusations proposals bigoted say policies would help minorities bolster economy create job trump also call climate change hoax chinese hurt business unite state sanders self-described democratic socialist manage turn long-shot run mass movement proposals combat wealth inequality increase access healthcare education defend environment 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 sanders say continue push liberal agenda head democratic national convention philadelphia july 25-28 clinton nomination expect become official also make clear want presence hurt party chance hold onto white house three-quarters likely democratic voters general election say sanders major role shape party position accord reuters/ipsos poll conduct june 17-21. nearly two-thirds also say sanders endorse clinton sanders vote clinton stop trump