The president made the remarks during the swearing in ceremony of the ruling SPLM faction secretary-general Peter Lam Both at the SPLM House in Juba on Tuesday morning.
In his speech, Kiir lamented the killing of three foreigners in Akon village where they were building a house for the president and said the incident has brought upon him shame.
“This has now brought me shame because people now do not fear to kill. President (Nelson) Mandela used to say that he had all the power people aspire for but asked what he would do with it,” the president lamented.
“I have the same predicament because I have powers but do not know what to do with them and as a result, the Juba Central Prison and other prisons are now overcrowded with people who have committed crimes that qualify them to hang,” he added.
He said he will have to put on his military uniform to lead the army to the frontline of disarmament.
“I am going to get a tent and go with the army, and camp and surround places where people are armed and disarm them,” Kiir vowed.
“This is the only solution,” he said.