National security adviser John Bolton has not yet called a Cabinet-level meeting to discuss the upcoming summit between President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE and North Korean leader Kim Jong Un, Politico reported Thursday.

Sources told the news outlet that Trump’s preparation ahead of the summit with Kim has been “unstructured.” The president has reportedly not consulted heavily with his national security team, instead relying largely on Secretary of State Mike Pompeo Michael (Mike) Richard PompeoTreasury sanctions individuals, groups tied to Russian malign influence activities Navalny released from hospital after suspected poisoning Overnight 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 MORE.

Trump has also not yet led a meeting focused on the North Korea summit with officials from his national security council, Politico reported.

White House press secretary Sarah Huckabee Sanders said Monday that Trump "has been receiving daily briefings on North Korea from his national security team."

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Bolton, who joined the Trump administration in April, will travel with Trump to Singapore next week for the summit, White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE said.

Trump and Kim are scheduled to meet June 12 at a luxury resort.

Trump publicly disagreed with Bolton’s comments on North Korea last month after the national security adviser said the “Libya model” could serve as a blueprint for getting Kim to get rid of his nuclear weapons.

Libyan leader Moammar Gadhafi was ousted from power and killed eight years after surrendering his nuclear weapons in a deal with the George W. Bush administration.

After Bolton's initial comments, North Korea issued a statement blasting Bolton and blaming him for endangering the summit.

Bolton did not attend an Oval Office meeting last week when a top North Korean official, Kim Yong Chol, visited the White House and hand-delivered a letter from Kim to the president.