Former Governor of Mississippi Haley Barbour (r) with Republican National Committee Reince Priebus (2-l) and Other Convention Officials Conducts Convention Business the Quicken Loans Arena on the First Day of the 2016 Republican National Convention in Cleveland Ohio Usa 18 July 2016 the Four-day Convention is Expected to End with Donald Trump Formally Accepting the Nomination of the Republican Party As Their Presidential Candidate in the 2016 Election United States Cleveland