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

White House hopeful Rep. Tim RyanTimothy (Tim) RyanDemocrats tear into Trump's speech: It was a 'MAGA rally' Democrats walk out of Trump's address: 'It's like watching professional wrestling' Trump set to confront his impeachment foes MORE (D-Ohio) on Sunday compared President TrumpDonald John TrumpRussian sanctions will boomerang States, cities rethink tax incentives after Amazon HQ2 backlash A Presidents Day perspective on the nature of a free press MORE's unprecedented visit with North Korean leader Kim Jong UnKim Jong UnDonald Trump: Unrepentant, on the attack and still playing the victim Trump's 'two steps forward, one step backward' strategy with China Overnight Defense: Senate votes to acquit Trump | Highlights from State of the Union | Trump defends Soleimani strike | Service member surprises family at speech | Air Force tests ICBM 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 BidenJoe Biden lost his fastball — can he get it back before South Carolina? Where the 2020 Democrats stand on taxes Bloomberg hits Sanders supporters in new ad MORE hit Trump for “coddling” dictators, citing his chummy meetings with Kim and Russian President Vladimir PutinVladimir Vladimirovich PutinHow impeachment damaged US foreign policy Trump administration mulling special negotiator for nuke talks with Russia: report Former Goldman Sachs CEO rips Sanders after NH win: 'He'll ruin our economy' MORE.

Sen. Elizabeth WarrenElizabeth Ann WarrenJoe Biden lost his fastball — can he get it back before South Carolina? Where the 2020 Democrats stand on taxes Budget hawks frustrated by 2020 politics in entitlement reform fight 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 SandersJoe Biden lost his fastball — can he get it back before South Carolina? Where the 2020 Democrats stand on taxes Bloomberg hits Sanders supporters in new ad MORE (I-Vt.) blasted the meeting as having “weakened the State Department.”

Several other candidates weighed in, with only one, entrepreneur Andrew YangAndrew YangTrump seeks split-screen moments in early primary states More accusers come forward after Evelyn Yang breaks silence on alleged assault by OBGYN Sanders leads Biden in latest Nevada poll 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.