Donald Trump was the first president in American history to be impeached twice. Now, he may be the first modern president, current or former – to be charged with criminal conduct. The New York investigation into hush money paid to adult entertainment actor Stormy Daniels is just one of several criminal probes currently faced by Donald Trump, And it's the one that is closest to issuing charges. Amid all the legal drama Trump has announced his third bid for the White House. A pending indictment would usually be a golden opportunity for Trump's Republican challengers - some who have declared - like Nikki Haley - and those who are expected to jump in the race - like Mike Pence and Ron DeSantis. But for the field of Republican presidential candidates, taking Trump down while not alienating his base is risky business. Host Scott Detrow talks to NPR congressional correspondent Kelsey Snell. He also talks to Jeff Sharlet, a professor of English at Dartmouth college and the author of the new book "Undertow: Scenes from a Slow Civil War."