washington democratic u.s. senator elizabeth warren keep assault republican presidential candidate donald trump thursday strongly word speech label trump racist accuse republican party foster intolerance donald trump choose racism weapon aim exactly rest republicans warren say remark deliver washington meet american constitution society liberal group warren fiery critic wall street favorite among liberals possible run mate hillary clinton week become presumptive democratic nominee nov. presidential election trump draw strong criticism include republican leaders attack mexican-american u.s. district judge gonzalo curiel oversee fraud lawsuits defunct real estate train school republican candidate accuse curiel american bear indiana inherent bias heritage trump campaign pledge curb illegal immigration build wall along u.s.-mexico border judge curiel one countless american patriots spend decades quietly serve country sometimes great risk life warren say donald trump loud nasty thin-skinned fraud never risk anything anyone serve nobody himself thursday remark late war word trump warren trump dub warren goofy often taunt campaign trail warren brand trump loser last month tweet record embarrass reuters report wednesday warren soon endorse clinton months remain neutral democratic primary battle clinton challenger leave u.s. senator bernie sanders warren consider idea serve clinton run mate although see obstacles choice source say warren keep assault white house hopeful trump judge comment