The North's official KCNA news agency said Washington was " misleading public opinion" by claiming the denuclearisation pledge was the result of sanctions and other pressure.
He slammed the United States for saying that it would not ease the sanctions and pressure until North Korea gives up its nuclear weapons completely.
Trump told reporters on Friday that arrangements for the meeting had been set but didn't elaborate any further.
The South's Yonhap news agency carried a similar report.
A day earlier, the DPRK newspaper Rodong Sinmun also slammed Japan for attempting to derive its own benefit from the intensified diplomatic process between North and South Korea and the United States.
Mr Trump this week expressed a preference for the DMZ but also said Singapore was possible.
Amidst the claims from President Trump [VIDEO], the North Korean leader wants to make clear that the topic of denuclearization and agreeing to meet with President Trump was his decision.
The hotline was set up on April 20, a week before the historic summit between Moon and Kim on April 27 on the South Korean side of the Joint Security Area in Panmunjom where Moon and Kim signed a Panmunjom Declaration in which the two Koreas "confirmed the common goal of realizing, through complete denuclearization, a nuclear-free Korean Peninsula".
Impoverished North Korea has been hit by a series of United Nations and U.S. sanctions in recent years in a bid to rein in its nuclear and missile programmes.
Trump said a troop withdrawal "is not on the table" and said "we haven't been asked to".
"This act can not be construed otherwise than a unsafe attempt to ruin the hard-won atmosphere of dialogue and bring the situation back to square one". The South Korean president said in January that Trump "deserves big credit for bringing about the inter-Korean talks".
He added: "Stayed tuned. Good things are happening, but only time will tell!"
Trump hinted at their impending release last week, tweeting, "Stay tuned!"
At that speech in MI, the crowd chanted "Nobel, Nobel, Nobel", possibly suggesting the president deserves the Nobel Peace Prize for his achievements.
Dr. David Kay, Senior Fellow at the Potomac Institute for Policy Studies said up to 300 inspectors would be needed in the North, but it would be hard to find enough specialists with the necessary skills and experience.