A former Justice Minister and Attorney General in Tonga, Alisi Taumoepeau, says it is premature to call for more constitutional change.
Tongans go to the polls on Thursday this week in just the second election since major political reform in 2008 gave the people more say in the make up of parliament.
The Democratic Party led by Akilisi Pohiva is campaigning to have all the parliament, including the nobles, elected by the people.
It says this will ensure greater accountability from leaders.
But Ms Taumoepeau says it is too soon for more change.
"We have gone up from 9 members to 17 members. We have only had 4 years and we are in the process of learning how to deal with that. To talk about reviewing the constitutional amendments after 4 years is probably premature."