Why President Trump's Lawsuits Face 'An Uphill Battle'

President Trump has vowed to challenge the election results, which have declared Joe Biden as the president-elect. The legal challenges began well before Election Day with lawsuits over mail-in voting and which ballots were “legally” cast. Guy-Uriel Charles, professor of law at Duke and co-director of the Center of Law, Race and Politics, appeared on PBS NewsHour discusses what the president must prove to win in court. (Interview follows short ad.)