The PDM leader McHenry Venaani said then changes made by President Hage Geingob are not enough because he has retained the position of the vice president.
Geingob announced a new government structure ahead of his inauguration set for Saturday either at State House or a hotel.
The post of the vice president was created in 2014 when the Constitution was amended.
Speaking to Eagle FM on Monday, Venaani said Namibia does not need a vice president and a deputy prime minister.
The opposition leader said South Africa and other countries that have a bigger population than that of Namibia did not have the posts of a vice president and a prime minister.
According to Venaani, he told Geingob when the position was created that it was not necessary but the president apparently said that it was meant to balance the tribes.
“But the three positions are occupied by people from the same tribe,” Venaani said.
Venaani, however, said that Geingob did well to merge some ministries such as the Home Affairs, Immigration, Safety and Security and the Environment, Forestry and Tourism.
IPPR director Graham Hopwood also said that enough needed to be done and that Geingob was supposed to have been more radical.
