The Democratic chairmen of three House committees are accusing President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE of withholding “critical information” from lawmakers about his administration’s ongoing negotiations with North Korea.

In a letter to Trump sent Thursday — days before he is scheduled to depart for a second summit with North Korean leader Kim Jong Un in Hanoi, Vietnam — the leaders of the Foreign Affairs, Intelligence and Armed Services committees criticized the administration for failing to brief Congress on North Korea denuclearization talks since the first summit between Trump and Kim in Singapore in June.

The Democratic chairmen demanded that Secretary of State Mike Pompeo Michael (Mike) Richard PompeoOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Overnight Defense: House Democrats unveil stopgap spending measure to GOP opposition | Bill includes .6B for new subs | Trump issues Iran sanctions after world shrugs at US action at UN Navalny calls on Russia to return clothes he was wearing when he fell ill MORE brief all members of the House on the outcomes of both summits within a week after the forthcoming summit in Vietnam concludes.

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“There is no legitimate reason for having failed to provide regular, senior-level briefings to the relevant committees of jurisdiction on a matter of such significance to our national security,” Reps. Eliot Engel Eliot Lance EngelHouse panel halts contempt proceedings against Pompeo after documents turned over Engel subpoenas US global media chief Michael Pack The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-N.Y.), Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-Calif.) and Adam Smith David (Adam) Adam SmithWhen 'Buy American' and common sense collide Overnight Defense: Marine Corps brushes off criticism of Marines' appearance in GOP convention video | US troops injured in collision with Russian vehicle in Syria | Dems ask for probe of Vindman retaliation allegations Democrats press Pentagon watchdog to probe allegations of retaliation against Vindman brothers MORE (D-Wash.) wrote Thursday.

The lawmakers also accused the administration of failing to provide Congress appropriate access to intelligence on North Korea’s nuclear and conventional weapons programs and failing to produce a report on North Korea's nuclear program as mandated by annual defense policy legislation.

They expressed support for an agreement with Pyongyang that results in “complete and fully verified dismantlement” of its nuclear and ballistic missile programs. However, they expressed skepticism about Kim’s commitment to denuclearization, citing in part recent public testimony from Director of National Intelligence Dan Coats Daniel (Dan) Ray CoatsFBI chief says Russia is trying to interfere in election to undermine Biden The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Former Intel chief had 'deep suspicions' that Putin 'had something on Trump': book MORE.

Coats testified before the Senate Intelligence Committee last month on a new U.S. intelligence assessment showing that North Korea is “unlikely to completely give up its nuclear weapons and production capability.” The intelligence assessment also noted officials have observed “activity that is inconsistent with full denuclearization.”

“We are perplexed and troubled by the growing disconnect between the Intelligence Community's assessment and your administration's statements about Kim Jong Un's actions, commitments, and intentions,” the Democratic lawmakers wrote.

“Furthermore, our ability to conduct oversight of U.S. policy toward North Korea on behalf of the American people has been inappropriately curtailed by your administration's unwillingness to share information with Congress,” they wrote.

Trump is expected to meet with Kim for the second time in Hanoi on Feb. 27 and 28. Senior administration officials told reporters Thursday that the two leaders would have an “opportunity” to meet one-on-one and dine together, as well as participate in expanded meetings of their respective delegations.

The summit in June — the first between a sitting U.S. president and North Korean leader — resulted in a joint declaration in which Pyongyang and Washington agreed to work toward the “complete denuclearization of the Korean peninsula” but was light on specifics of how it would be achieved. Following the summit, Trump claimed on Twitter that North Korea “no longer” presented a nuclear threat.

However, experts have since cast doubt on Pyongyang’s commitment to denuclearization. Reports in recent months based on commercial satellite imagery have indicated North Korea is continuing to work on its missile program.

Critics have also pointed to the intelligence assessment as seemingly out of step with Trump’s pronouncements.

Trump has touted the progress on North Korea among his achievements, claiming in a news conference last week that the Japanese prime minister had nominated him for a Nobel peace prize for his work opening up talks with Pyongyang. Trump has also claimed the U.S. would be “in a major war” with North Korea had he not been elected.

Earlier this week, he told reporters that he was in “no rush” to deliver on denuclearization if Pyongyang does not conduct any nuclear tests.

“We’re in no rush whatsoever,” Trump told reporters Tuesday. “We’re going to have our meeting. … As long as there’s no testing, I’m in no rush. If there’s testing, that’s another deal.”

A senior administration official said Thursday that the president’s primary goal in the second summit is to achieve full denuclearization, describing the meeting as “an important step to that goal.”

“That is the overriding goal that President Trump is seeking to achieve with this summit,” the official said.