Senate Homeland Security chairman: ‘Let’s not be Charlie Brown to North Korea’s Lucy’

Senate Homeland Security Chairman Ron JohnsonRonald (Ron) Harold JohnsonGOP senator: 'No problem' with Mueller testifying The Hill's Morning Report — Category 5 Mueller storm to hit today GOP senators double down on demand for Clinton email probe documents MORE (R-Wis.) said on Sunday that President TrumpDonald John TrumpThorny part of obstruction of justice is proving intent, that's a job for Congress Obama condemns attacks in Sri Lanka as 'an attack on humanity' Schiff rips Conway's 'display of alternative facts' on Russian election interference MORE needs to keep up "maximum" pressure on North Korea ahead of an unprecedented summit.

“Let’s not be snookered again,” Johnson said on CNN's "State of the Union." “Let’s not be Charlie Brown to North Korea’s Lucy.”

Johnson noted that he joined in a letter with five other Senators “encouraging President Trump to make sure to maintain that maximum pressure until we see complete verifiable and irreversible denuclearization within North Korea.”

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Trump announced on Thursday that would accept an invitation to meet with North Korea’s leader Kim Jong Un, the first sitting U.S. president to do so.

According to South Korea, North Korea is willing to stop missile testing while talks with the U.S. are ongoing.

Johnson said on Sunday that for talks with North Korea to be successful, the president has to keep up pressure on the regime and even "ratchet up" sanctions.

“What we can’t do is what we did with Iran, let out the pressure and then just watch the behavior go in the wrong direction,” Johnson said.