Pheu Thai Party's prime ministerial candidate Srettha Thavisin waves as he leaves after a press conference at Pheu Thai headquarter in Bangkok, Thailand, May 14, 2023. (PHOTO / AP)

BANGKOK - Thailand's Pheu Thai Party vowed on Monday to deliver on a raft of election promises and change the constitution, as it unveiled an 11-party alliance that includes some rivals that will try to form a coalition government this week.

Thailand's bicameral parliament has been deadlocked for weeks on forming a government, after the Move Forward party succumbed to resistance in parliament, leaving second-placed Pheu Thai to take up the effort.

Parliament will vote on Tuesday on the prime ministerial bid of Pheu Thai's Srettha Thavisin, a 60-year-old real estate mogul who was thrust into politics only a few months ago

Parliament will vote on Tuesday on the prime ministerial bid of Pheu Thai's Srettha Thavisin, a 60-year-old real estate mogul who was thrust into politics only a few months ago.

"We are confident that Srettha will pass the vote," Pheu Thai leader Cholnan Srikaew told a press conference.

"We must quickly work to restore the economy and come up with policies that will develop mechanisms for the stability of politics, the economy and society," he said, after announcing how many cabinet portfolios each party would get.

Cholnan acknowledged the political divisions in the alliance but said rival forces had a duty to the public to not delay the formation of a government.

"Throughout this time we faced division with a fair heart and a determination to overcome that division," he said. "The goal right now is shared responsibility for the sake of the country."

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The alliance comprises 314 lawmakers and Srettha needs 375 votes from the combined upper and lower houses of parliament to be endorsed as premier and form the next government. It will be counting on support from non-alliance members, including from the upper house Senate, to get it over the line.

Pheu Thai said it would lead a coalition government that would deliver on populist promises including tackling graft, boosting the minimum wage and providing handouts in digital currency.

It also said it would forge ahead with changing the constitution to make it more democratic.

Move Forward has declined to back Pheu Thai's multi-party effort, calling it a distortion of the election result and against the public will.