The charter should be rewritten to allow for a neutral prime minister to assume control if political deadlock occurs in the future, which could prevent another military coup, according to the Chart Pattana Party.
The party offered its input on the charter redraft to the Constitution Drafting Committee (CDC). The Palang Chon Party also shared its views.
The Chart Pattana Party, which was the third political party to voice its views on the charter rewrite, said the new constitution should be flexible so it can resolve any critical political stalemates in the future, said Gen Lertrat Rattanawanich, the CDC spokesman.
The Chart Pattana representative proposed that when the country faces a political dead-end, the charter should provide the House of Representatives with a way of choosing a neutral prime minister, who is a non-MP, and who needs votes from three quarters of MPs.
The neutral prime minister would have specific tasks of amending laws to resolve the crisis and subsequently organising an election, according to the party.
The proposal was drawn from past experiences when elected prime ministers came under pressure to step down or were impeached.
Under the previous constitution, an impeached premier was replaced by a sitting MP voted for by the majority of members of the Lower House.
Experts said a neutral prime minister to break a political impasse would remove the excuse for military intervention.
Gen Lertrat said the two political parties agreed that the content of the new charter should be concisely worded so it is not misinterpreted, which often spurred legal disputes.
The content should also be free of bias against any political group.
On electoral issues, Gen Lertrat said the two parties thought constituencies should not be too large because MPs would not be able to retain close contact with their constituents.
Also, a large constituency would give bigger parties an unfair advantage over smaller ones.
The two parties added if MPs in the party-list system are to be revived under the new charter, their numbers should be limited to no more than a quarter of the number of constituency MPs. The minimum qualifications of party-list MPs should be set higher than those of the constituency MPs as they are expected to have specialised knowledge necessary for legislative duty.
The CDC spokesman said both Chart Pattana and Palang Chon disagreed with having independent MPs who are not affiliated to political parties. They were concerned the MPs would be bought by political parties to work under their wings in parliament.
The two parties suggested MPs should be allowed to propose bills without having to obtain prior permission from their affiliated parties. They should also be able to express their views in an impeachment debate in parliament.
Gen Lertrat said the parties wanted a clear separation of powers by recommending that any MP who becomes prime minister or a cabinet minister must first resign their seat in the Lower House.
Meanwhile, Prime Minister Prayut Chan-o-cha said yesterday there should be no problem with organising a referendum on the new charter, the drafting of which is expected to be completed in the latter half of next year, if all parties cooperate.