The shaka sign, sometimes known as "hang loose," is a gesture of friendly intent often associated with Hawaii, and surf culture.

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Washington (CNN) — Sen. Bernie Sanders expressed his disappointment Monday with Hillary Clinton's failure to secure the support of white working-class voters in last week's presidential election.

Donald Trump "very effectively" tapped into "the anger and angst and pain that many working class people are feeling," the Vermont independent senator who challenged Clinton in the Democratic primary said on "CBS This Morning."

"I think that there needs to be a profound change in the way the Democratic Party does business," Sanders said. "It is not good enough to have a liberal elite. I come from the white working class, and I am deeply humiliated that the Democratic Party cannot talk to where I came from."