Supporters and lawyers of the man said he had an IQ of 69 and was intellectually disabled, and that the execution of a mentally ill person was prohibited under international human rights law.
The Malaysian man recognized as having an intellectual disability has been on death row since 2010 for trying to smuggle less than 1.5 ounces of heroin into Singapore.
Singapore's government will stop covering the cost of COVID-19 treatment for those who are "unvaccinated by choice" next month, citing the strain they are placing on its health care system.
The vice president spoke at a news conference in Singapore alongside Prime Minister Lee Hsien Loong, who offered the use of his country's air force to assist with evacuations.
The long-planned trip is now complicated by the chaotic U.S. withdrawal from Afghanistan, which is drawing comparisons to the fall of Saigon in the aftermath of the Vietnam War.
The government had previously said data collected by its widely used app would only be used for contact tracing. The program is seen as a key part of the country's success in managing the coronavirus.
The man had undergone mandatory testing before embarking on the ship. But after the journey was cut short, the man tested negative twice as authorities sought to confirm his status.
The arrangement, originally slated to begin Sunday, would have provided some travelers the ability to bypass a 14-day quarantine period. But new cases in Hong Kong have put the plan on hold.
