Bernie Sanders Says He Can Do Better Against Donald Trump Than Hillary Clinton

The Vermont senator talked with ABC News' George Stephanopoulos on "GMA" today.

Clinton yesterday urged Democrats to consider who would be most likely to win in a general election against the Republicans. “Think hard about the people who are presenting themselves to you, their experience, their qualifications, their positions,” she said. “But particularly for those of us who are Democrats, their electability.”

But Sanders pointed to a recent Quinnipiac University poll that showed Clinton leading Trump by 7 percentage points nationally, 47 vs. 40 percent. But in the same poll, Sanders leads by a broader 13 points, 51 vs. 38 percent. Still, some Democrats think that Bernie Sanders' liberal positions may alienate some independent voters.

Recent polling shows Clinton maintaining a slim lead in Iowa.

The comments come hours after North Korea claimed to have tested a hydrogen bomb. "We'll have to lean on China," Sanders said of the U.S. strategy. "China is North Korea's closest ally. They'll have to push North Korea to start adhering to international agreements.

"When you have a hydrogen bomb, if that's true, you are a threat to China, as well," he added.

Sanders also vowed to break up big banks, saying his plan is tougher than Clinton's.

"That's dangerous to our economy and to our political life. We have to break them up," he said. "We have to re-establish Glass-Steagall legislation,” which prohibited commercial banks from participating in the investment banking business. “That is not Secretary Clinton’s position.

Clinton does not support reinstating the Glass-Steagall Act, saying that her plan goes after the “shadow banking” system.

"We are pleased to see that Senator Sanders is finally talking about the importance of dealing with risks posed by activities in the shadow banking system. Unfortunately, however, he failed to put forward a single new proposal that addresses those risks," the Clinton campaign said in response. "We already knew that Senator Sanders wants to break apart financial institutions. What we haven't seen is his plan to deal with the risky shadow banking activities that brought our economy to the brink of collapse in 2008."