The senior official said that the US military contingent presence in South Korea is not the subject to negotiations between Washington and Pyongyang as it is a matter of relations between South Koreans and Americans.
Donald Trump gave North Korea security assurances and indicated he would suspend military exercises with South Korea.
Recently, Pentagon spokesperson Christopher Logan said that the US Defense Department was working with the White House on options to halt military exercises with South Korea.
On June 12 Trump and Kim met on the Singaporean island of Sentosa. Following the meeting, the leaders signed a document showing their commitment to establish new bilateral relations and build a lasting peace on the Korean Peninsula.
After the summit the Donald Trump stated, that military exercises in the region were "provocative" and might be suspended.
Pyongyang reaffirmed its commitment to the "complete denuclearization of Korean Peninsula."
In April, Kim Jong-un met with South Korean President Moon Jae-in and agreed to jointly work on peacefully resolving long-standing bilateral tensions.