Matthew Green , associate professor, politics, was interviewed by U.S. News before the meeting of Donald Trump and Paul Ryan. See below.

Trump's Toughest Sell Yet

From: U.S. News Date: May 11, 2016 Author: James Warren

... "There's always been an expectation that party leaders support their presidential nominee," says Green. "It's a big reason why some Republicans are behind Trump even if it puts them in electoral danger or compromises their core principles." ...

> Continue reading.

Read more about Green's expertise .