Jeong Yong-ki, chairman of the policy committee of the main opposition Liberty Korea Party, said during a lecture before civil servants in Cheonan city that in "some aspects" the North Korean leader is better than Moon, a progressive, Newsis reported Friday.
"Although Chairman Kim is revoltingly barbaric, if you take away his barbarism, his illegal tendencies, his inhumanity, as a leader he is better than our president, Moon Jae-in," Jeong said.
The ruling party is calling for Jeong's expulsion.
Lee Hae-sik, spokesman for Moon's Democratic Party, said at a press briefing on Friday Jeong should be dismissed from public life and an apology should be made to the country, News 1 reported.
"After disparaging the president as the chief spokesman for Kim Jong Un, the Liberty Korea Party is now saying Chairman Kim is a better leader than the president, ridiculing him," Lee said, adding the comparison is an insult to the office of the president.
Politicians of other parties condemned Jeong.
Left-wing Justice Party spokesman Choi Seok said Jeong had made a remark that threatens the state and could be found in violation of the country's national security law.
"If one likes North Korea so much, I would like to tell him to go resettle in North Korea," Choi said.
Hwang said Jeong was trying to call for a greater show of responsibility on the part of the Moon administration, but his remarks were excessive.
The party previously fell under criticism when politician Na Kyung-won said Moon was acting as the chief spokesman for North Korea.
Na later said she was quoting a Bloomberg news article.