The United Nations has warned South Sudan that it would take "immediate action" if the President Salva Kiir does not sign a peace deal with rebels.
According to the BBC, Kiir is scheduled to sign a peace deal on Wednesday to end months of brutal civil war.
However, the President's spokesman said that he still had "reservations".
Rebel leader Riek Machar had signed the peace deal last week but had Kiir refused.
Fighting between forces loyal to the two men has displaced over 2.2 million people.