washington republican presidential candidate donald trump say professional agitators bore much blame violence rally video show protester beat another apparently grab trump campaign manager speak abc week sunday trump defend campaign manager corey lewandowski decline condemn supporters attack protesters increasingly chaotic rally back warn would riot streets republican party deny nomination november election despite popular candidate among republican voters senior figure party openly plot prevent trump become nominee view insufficiently conservative trump due privately meet party leaders washington monday washington post report know go happen say go lot unhappy people say week predict anger party national convention july someone else end nominee want see riot want see problems talk millions people scenes mayhem become increasingly common billionaire new york businessman rally frequently interrupt protesters many democrats say trump controversial remark immigrants muslims dangerous 69-year-old candidate sometimes encourage supporters use violence protesters least one occasion say would like punch protester television footage arizona rally saturday show man punch kick protester lead event another video appear show lewandowski grab protester back shirt trump decline condemn violence say often provoke protesters briefly block highway lead arizona rally saturday people disruptive people innocent lamb say also defend lewandowski say security official actually grab protester lewandowski also manhandle reporter last week accord washington post give credit spirit trump say lewandowski republican leaders say trump need clearly discourage supporters engage violence two dozen senior republican figure meet trump law firm near capitol monday afternoon trump campaign describe effort improve party unity washington post report newspaper say would attend candidates also require submit recently monthly financial disclosures federal election commission sunday hillary clinton front-runner democratic party nomination raise 30.1 million february accord file 12 million less raise chief rival u.s. senator bernie sanders vermont period clinton begin march 31 million cash hand accord file trump refuse condemn violence u.s. presidential rally