 Paisley's DUP was initially involved in the negotiations under former United States Senator George J. Mitchell that eventually led to the Good Friday Agreement in 1998, but the party withdrew in protest when Sinn Féin was allowed to participate after the Provisional IRA's 1994 ceasefire.Instead, Paisley travelled to Cameroon with the documentary filmmaker Jon Ronson, filming an episode of the television series "Witness" called "Dr Paisley, I Presume".Paisley and his party opposed the Agreement in the referendum that followed its signing, which saw it approved by over 70% of the voters in Northern Ireland and by over 90% of voters in the Republic of Ireland.