Republicans not supporting Trump are the highest ever

Jacob Neiheisel, assistant professor of political science, was interviewed live on CNBC about the presidential election campaign, Donald Trump’s high-negative numbers, the GOP convention in July, Bernie Sanders’ role in the Democratic race and his recent tweet about his tax return, and the upcoming primary elections, where, he said, a good performance in California might seal up the nomination for Trump.

Watch here:

http://video.cnbc.com/gallery/?video=3000510952