GOP Sen. Johnson: Trump must keep pressure on NK ahead of talks

CNN: Republican Sen. Ron Johnson said Sunday that President Donald Trump must continue to ratchet up pressure on North Korea to denuclearize, even as the two countries prepare to meet for talks.

"We can't do what we did with Iran and let off the pressure and then just watch the behavior go in the wrong direction," the Wisconsin Republican, who serves on the Senate Foreign Relations Committee, said on CNN's "State of the Union."

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