Kim, a member of the Korean Workers' Party's central committee who reportedly died Monday at the age of 98, was also a member of the Supreme People's Assembly.
"North Korea has a big job to do".
Trump and other administration officials have said sanctions against North Korea should remain in place until a deal is finalized.
North Korea media reported Kim died of a chronic disease.
Kim pretends to disarm and Trump pretends to believe him.
Workers paint a North Korean flag atop a building on Kim Il-Sung square on July 7, 2016. "Any denuclearization agreement would require North Korea to allow worldwide inspectors to determine that these units are no longer armed with nuclear weapons", according to the report from Lewis and Schmerler. His administration has also repeatedly claimed progress in talks with North Korea, citing the lack of nuclear and ballistic missile tests since the country launched its Hwasong-15 intercontinental ballistic missile in November of a year ago.
"North Korea appears to have begun to expand the base significantly, starting with the construction of a new headquarters area in 2014", the report stated.
President Trump committed to provide security guarantees to the DPRK, and Chairman Kim Jong Un reaffirmed his firm and unwavering commitment to complete denuclearization of the Korean Peninsula.
Washington and Pyongyang had been locked in a diplomatic standoff for weeks over which side would make concessions first. Despite summit talks on denuclearizing the Korean Peninsula, satellite footage showed that Pyongyang was continuing its missile program.
North Korean efforts to upgrade and expand a long-range missile base come as no surprise to USA intelligence officials, who have always been wary of promises by Pyongyang to denuclearize. "These shelters are similar to the ones seen at the older portion of the Yeongjeo-dong base".