Tim Ryan: Trump going to North Korea 'like Chamberlain going to talk to Hitler'

White House hopeful Rep. Tim RyanTimothy (Tim) John RyanDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE (D-Ohio) on Sunday compared President TrumpDonald John TrumpUS-Saudi Arabia policy needs a dose of 'realpolitik' Trump talks to Swedish leader about rapper A$AP Rocky, offers to vouch for his bail Matt Gaetz ahead of Mueller hearing: 'We are going to reelect the president' MORE's unprecedented visit with North Korean leader Kim Jong UnKim Jong Un Majority of voters aren't confident Trump's diplomacy will lead to North Korea denuclearization The Hill's Morning Report - Trump seizes House impeachment vote to rally GOP Trump blasts 2020 Dems during campaign rally MORE in the hermit nation to British Prime Minister Neville Chamberlain meeting with Adolf Hitler.

"They talk about historic moments. This is historic, him going to North Korea is like Chamberlain going to talk to Hitler," Ryan said on CNN's "Reliable Sources." 

"I mean, this guy was lobbing missiles into the Sea of Japan just a few weeks ago and the president is going to talk to him? I mean, are you kidding me?” Ryan added of Kim.

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Trump made history Sunday by becoming the first sitting U.S. president to enter North Korea.

He and Kim then met with Kim for a surprise negotiation session that lasted almost an hour on the South Korean side of the Demilitarized Zone.

Trump has touted the meeting as a diplomatic success that will improve U.S.-North Korea ties. The president has met with Kim three times now in efforts to denuclearize the Korean peninsula.

In the lead up to World War II, Chamberlain traveled to Germany to meet with Hitler several times but was unable to prevent him from continuing to seize territory. Chamberlain has been criticized for his appeasement policy that ultimately only delayed the war.

Democrats have blasted the meeting between Trump and Kim, accusing Trump of cozying up to a dictator and throwing cold water on the importance of negotiations.

A spokesman for former Vice President Joe BidenJoe BidenBiden compares Trump to George Wallace Sanders unveils plan to guarantee the 'right to a secure retirement' CNN Democratic debate drawing finishes third in cable news ratings race MORE hit Trump for “coddling” dictators, citing his chummy meetings with Kim and Russian President Vladimir PutinVladimir Vladimirovich PutinFunding a strong defense of our nation's democratic process can't wait Poll: Michelle Obama most admired woman in the world The Hill's Morning Report - Trump seizes House impeachment vote to rally GOP MORE.

Sen. Elizabeth WarrenElizabeth Ann WarrenJulián Castro is behind in the polls, but he's finding a niche Gabbard arrives in Puerto Rico to 'show support' amid street protests Democratic strategist predicts most 2020 candidates will drop out in late fall MORE (D-Mass.) tweeted that Trump "shouldn’t be squandering American influence on photo ops and exchanging love letters with a ruthless dictators."

Sen. Bernie SandersBernie SandersGabbard arrives in Puerto Rico to 'show support' amid street protests Democratic strategist predicts most 2020 candidates will drop out in late fall Sanders unveils plan to guarantee the 'right to a secure retirement' MORE (I-Vt.) blasted the meeting as having “weakened the State Department.”

Several other candidates weighed in, with only one, entrepreneur Andrew YangAndrew YangDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE, praising the talks.

“Anything that improves the political climate on the Korean peninsula and engages North Korea on its nuclear program is a good thing,” Yang tweeted.