Thailand's joint parliament session voted Thursday to pass three government-sponsored bills intended to amend many sections of the country's Constitution.

All the three bills were approved in the first reading, after which a 45-member committee will be set up to deliberate the second reading within 15 days. The bills must be resubmitted to the Parliament for the third reading or final approval.

The first amendment bill is meant to call for an election of all senators instead of the present system under which senators are both elected and appointed.

The second bill is related to the state's agreements with other countries and international organizations.

The third bill is aimed at relaxing the rules on a party's dissolution or banning of party executives due to violations of the election law by party candidates.

Under current rules, if a party executive was found involved in electoral fraud, the party would be dissolved.

The three bills were nodded after three days of heated debate amid a petition by a group of 40 senators seeking an injunction by the Constitution Court.

The court on Wednesday accepted the petition but did not give its ruling, pending further consideration and decision.