Trump cleaves the GOP into unprecedented alliances

Donald Trump continues to thumb his nose at the Republican Party. He's expressed no regrets about attacking a Gold Star Family, despite criticism from GOP leaders, including House Speaker Paul Ryan and Arizona Senator John McCain. Despite their concerns, they have not withdrawn their endorsements of Trump. But he's now refusing to endorse them in primary elections coming up soon. Ron Elving, senior editor and correspondent on the Washington Desk for NPR News, has more.