In a wide-ranging discussion, Trump also said he disapproved of Russian President Vladimir Putin's actions in eastern Ukraine, called for a renegotiation of the Paris climate accord, and said he would dismantle most of the Dodd-Frank financial regulations if he is elected president.

The presumptive Republican nominee declined to share details of his plans to deal with North Korea, but a meeting with Kim would mark a major shift in U.S. policy towards the isolated nation.

"I would speak to him, I would have no problem speaking to him," Trump said of Kim.

"At the same time I would put a lot of pressure on China because economically we have tremendous power over China," he said in the half-hour interview at his Trump Tower office in Manhattan.

China is Pyongyang's only major diplomatic and economic supporter.