Sen. Ben Cardin (D-Md.) on Friday warned that any military action toward North Korea carries "extreme risk," adding that tensions on the Korean Peninsula need to be resolved through diplomacy.

"I think everyone understands that the only way to resolve this is through diplomacy," Cardin, a member of the Senate Foreign Relations Committee, said on CNN. "There is no military option without extreme risk."

"So it's puzzling that the president has now thrown diplomacy off track, and there's always a risk of a miscalculation. And a miscalculation can have extremely dangerous consequences."

Cardin's comments came a day after President Trump abruptly canceled a planned summit with North Korean leader Kim Jong Un that was set to take place in Singapore on June 12.

In a letter notifying Kim of his decision, Trump cited North Korea's "hostilities" toward the U.S. as his reason for withdrawing from the meeting. But he also left open the possibility of arranging another meeting.

South Korean officials were taken aback by the decision, with President Moon Jae-in reportedly saying on Thursday that he was "very perplexed" by the move.

North Korea said in a statement carried by state-run media on Thursday that it was still open to meeting with Trump "at any point."

"We reiterate to the U.S. that there is a willingness to sit down at any time, in any way, to solve the problem," North Korean Vice Foreign Minister Kim Kye Gwan said.