Dem Sen. Coons on Lindsey Graham's Calls to Investigate Bidens: 'He Will Come to Regret This Decision'

In a Sunday interview with MSNBC's "Kasie DC," Sen. Chris Coons (D-DE) echoed former Vice President Joe Biden's prediction that Sen. Lindsey Graham (R-SC) would "regret" launching an investigation into his dealings with Ukraine while serving in the Obama White House.