Bernie Sanders

"This guy is a fraud," Sanders told CNN's Jake Tapper on "State of the Union" Sunday.

"This guy ran for president of the United States saying, 'I, Donald Trump, I'm going to take on Wall Street -- these guys are getting away with murder.' Then suddenly, he appoints all these billionaires," Sanders said.

It took a last-minute campaign blitz and a significant financial investment for Clinton to win the Kentucky Democratic primary by half a percentage point over her stubborn primary foe Bernie Sanders — in a state she won by 35 percentage points over Barack Obama in their 2008 primary clash and where her family has deep political roots going back decades.