Despite the constitutional barrier between church and state in America, politicians hardly ever give a major speech without invoking religion. In particular, the political relationship between Christian evangelicals and the Republican Party has existed for decades. But is the expected announcement of Donald Trump as the Republican nominee next month about to shake things up? He is very different to the usual candidate that would appeal to the religious right. If he gets the evangelical vote, he'd be the first nominee to do so without really talking about God or the Bible. How has he proved so successful? Ernie Rea and guests discuss religion and the US Republican Party.

Producer: Dan Tierney