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

White House hopeful Rep. Tim RyanTimothy (Tim) RyanTim Ryan endorses Biden for president Strategists say Warren 'Medicare for All' plan could appeal to centrists Trump mocks O'Rourke after Democrat drops out of race MORE (D-Ohio) on Sunday compared President TrumpDonald John TrumpButtigieg surges ahead of Iowa caucuses Biden leads among Latino Democrats in Texas, California Kavanaugh hailed by conservative gathering in first public speech since confirmation MORE's unprecedented visit with North Korean leader Kim Jong UnKim Jong UnHuman rights: Help or hindrance to toppling dictators? North Korea says US offered to resume nuclear talks in December North Korea issues warning over US-South Korea drills 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 BidenButtigieg surges ahead of Iowa caucuses GOP eager for report on alleged FBI surveillance abuse Biden leads among Latino Democrats in Texas, California MORE hit Trump for “coddling” dictators, citing his chummy meetings with Kim and Russian President Vladimir PutinVladimir Vladimirovich PutinThe analysts are wrong: Putin's aggression exposes Russia's decline Pelosi: Trump bribed Ukraine, makes Nixon's offenses 'look almost small' Scarborough: Trump is either 'an agent of Russia' or 'a useful idiot' MORE.

Sen. Elizabeth WarrenElizabeth Ann WarrenButtigieg surges ahead of Iowa caucuses Biden leads among Latino Democrats in Texas, California Following school shooting, Biden speaks out: 'We have to protect these kids' 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 SandersButtigieg surges ahead of Iowa caucuses Biden leads among Latino Democrats in Texas, California On The Money: Trump appeals to Supreme Court to keep tax returns from NY prosecutors | Pelosi says deal on new NAFTA 'imminent' | Mnuchin downplays shutdown threat | Trump hits Fed after Walmart boasts strong earnings MORE (I-Vt.) blasted the meeting as having “weakened the State Department.”

Several other candidates weighed in, with only one, entrepreneur Andrew YangAndrew Yang 2020 Democrats demand action on guns after Santa Clarita shooting Panel devolves over new Russian accusation about Tulsi Yang unveils '21st century approach' to regulating tech 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.