Election winners Move Forward still hope they can renominate party leader Pita Limjaroenrat for prime minister and that senators will give him enough support.
MFP Secretary-general Chaithawat Tulanon said on Monday that the party has petitioned the ombudsman to ask the Constitutional Court if Mr Pita can be renominated to parliament for the position of prime minister at the head of a coalition government.
He hoped the renomination would be allowed and there would be enough support from the military appointed senators.
Mr. Chaithawat said that he now believed about 56 senators were ready to support MFP's bid to lead the next government.
He acknowledged that several parties outside the eight-member coalition seemed willing to support Pheu Thai if it excludes MFP from the government. However, he said, if the eight-parties remain united there could be a way out.
Leaders of the eight parties were scheduled to meet on Tuesday, he said.
"If Pheu Thai and Move Forward go ahead and a prime minister is still not elected, society will have many questions for the senators and the other political parties," Mr Chaithawat said.
