Washington Post Media and Politics Reporter Callum Borchers: “They sometimes run into…alleged crimes that perhaps they didn’t envision at the outset”

FILE- In this June 21, 2017, file photo, former FBI Director Robert Mueller, the special counsel probing Russian interference in the 2016 election, departs Capitol Hill following a closed door meeting in Washington. A grand jury used by Mueller has heard secret testimony from a Russian-American lobbyist who attended a June 2016 meeting with President Donald Trump's eldest son, The Associated Press has learned. (AP Photo/Andrew Harnik, File)

Washington Post Media and Politics Reporter Callum Borchers describes why it’s appropriate for Donald Trump to step up to the plate as Special Counsel Mueller continues to investigate in the Russia probe. Callum distinguishes between collusion and obstruction of justice in the case of Donald Trump.