new york republican presidential candidate donald trump narrow deficit democratic rival hillary clinton percentage point 15 point late last week accord reuters/ipsos poll release tuesday poll way tuesday republican national convention cleveland officially nominate trump party candidate nov. presidential election clinton due officially nominate democratic convention philadelphia next week forty-three percent likely voters support clinton july 15-19 poll 36 percent support trump poll include 1,069 voters credibility interval measure accuracy percentage point previous poll trump trail clinton 15 percentage point cover five-day period end july 14. trump rise appear partly fuel decline number voters remain sideline percentage voters support neither candidate drop 12 percent july 15-19 poll 15 percent july 10-14 poll clinton lead poll year last time trump match clinton level support mid-may remain rival republican nomination drop many republican leaders start openly support bid white house week republican convention provide another opportunity party leaders publicly embrace trump campaign presidential nominees typically see boost voter support follow party conventions 2012 republican nominee mitt romney jump percentage point reuters/ipsos poll follow republican convention year however republican leaders struggle give full-throated endorsement trump america first campaign hard line immigration trade fiery rhetoric call bigoted many republican elders include former presidents bush last two presidential nominees romney john mccain stay away cleveland convention also mar protest anti-trump delegate controversy speech trump wife melania include section strikingly similar portion speech give michelle obama democratic convention 2008 husband barack obama seek first term president trump narrow gap clinton republicans rally cleveland reuters/ipsos