The event, which was led by Gloria Steinem, was controversial in the South and abroad, with critics saying it aided the Pyongyang regime.
But worries are growing that the government is trying to amend the U.S.-drafted charter by stealth.
Takeshi Onaga wants to discuss the democratic “contradiction” of forcing a base on people who do not want it.
The claim came a day after a top U.S. military officer said the country was years away from such technology.
Prime Minister Abe says the changes, which have generated heated debate, will strengthen ties with the U.S.
The defense minister was shot for offenses including sleeping in a meeting, according to South Korea.
Military service is compulsory, meaning hundreds of young men are jailed each year for dodging the draft.
The arrest is the latest sign of tensions between the countries as an abduction investigation has stalled.
In addition to a submarine ballistic missile launch, the “Great Successor” handed down guidance at a fish hatchery and a cow farm.
To boost career and romance prospects, young men in the country are taking up the skin-care craze.