The comments came at a political rally in West Virginia, where he's stumping for Patrick Morrisey, the GOP candidate hoping to unseat Sen.
"The perception that sanctions can bring us on our knees is a pipe dream of the people who are ignorant about us", Ri said.
Three senior USA officials involved in North Korea policy said last week that no progress has been made in moving towards serious negotiations on eliminating or even halting Mr Kim's nuclear weapons and ballistic missile programmes.
"Am I allowed to say that?" the president said.
Such demands - as well as a history of North Korea breaking past promises to dismantle its nuclear program - have raised questions as to whether or not the USA and North Korea will actually be able to reach a meaningful agreement.
The North Korean foreign minister, Ri Yong-ho, said on Saturday his nation would never abandon its nuclear weapons if it could not trust the US.
Trump and Kim have said they want to work toward denuclearizing the Korean peninsula, holding an unprecedented meeting earlier this year in Singapore to discuss the idea. They were great letters.
North Korea's top diplomat did not mention Trump by name during his speech, nor did he offer him any praise or credit for the summit or warming of relations.
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"I was really being tough - and so was he".
China and Russian Federation argued that the UN Security Council should reward Pyongyang for steps taken.
Most flee via China, which has the longest border with North Korea and is easier to cross than the heavily protected Demilitarised Zone (DMZ) between the two Koreas.
Pyongyang has also made clear that they are looking for a formal declaration to the end of the Korean War.
However, U.S. Secretary of State Mike Pompeo told the UN Security Council on Thursday that: "Enforcement of Security Council sanctions must continue vigorously and without fail until we realize the fully, final, verified denuclearization".
President Donald Trump's rallies are a fairly boring affair these days - he stays more or less on script.
The Security Council has unanimously boosted sanctions on North Korea since 2006 in a bid to choke off funding for Pyongyang's nuclear and ballistic missile programs.
He said Kim had told him the "corresponding measures" he was seeking were security guarantees Trump pledged in Singapore and moves toward normalization of relations with Washington.