Seven Thai parties said Wednesday they had formed a "democratic front" following a controversial election. They claimed that the opposition won a majority in the House of Commons and the right to form a government.
The coalition is unlikely to participate in the election of a prime minister, which requires a combined vote with the House of Lords upper house, the Senate, which is fully appointed by the ruling generals who overthrew a elected Pheu Thai party government in 2014 ,
The election remains in doubt, the unofficial results are delayed until at least Friday and suspected voting and irregularities in the counting of votes.
"We want to prevent the regime from remaining in power," said Pheu Thai presidential candidate Sudarat Keyuraphan at a press conference announcing the coalition.
The Electoral Commission, appointed by the legislator hand-picked by the ruling junta, delayed the publication of a full preliminary vote. We reckon on election night and then again on Monday. The Commission has now announced that it will publish its final preliminary results on Friday.
Partial results still indicate that the Palang Pracharat party has enough votes to hold junta leader Prayuth Chan-ocha as prime minister.
But an opposition alliance in the House of Commons, the House of Representatives, could stall.
Thailand holds the first vote since the 2014 military coup
"Still moving numbers"
Sudarat said with the other parties, the opposition The Alliance would win at least 255 lower house seats based on partial results calculations.
"Even though the numbers are still moving, we're sure we'll have at least 255 seats below us," said Sudarat, adding to Pheu. Thai was also in talks with other parties.
"We declare that the democratic front, which defies military rule, commands the majority in the house."
Pheu Thai General Secretary Phumtham Wechayachai told reporters the Democra Tic Front now includes the Future Forward party, Pheu Chart, Prachachart, Seri Ruam Thai, Thai People Power and New Economy.
Thanathorn Juangroongruangkit, 40, and his Future Forward Party caught the attention of the estimated seven million time voters were frustrated over the country's 15 years of political division. He was, however, charged with cybercrime before the vote and his own future remains unclear.
"We will work with parties that stand today at this press conference, no matter what the obstacles are … We are ready to prevent the regime from remaining in power," Thanathorn said.
The pro-military Palang Pracharat party, which has won 97 lower House seats, has also claimed the right to form the next government because it leads the people's votes on Pheu Thai.  The vote on the Prime Minister is likely to take place in May, giving Palang Pracharath's candidate, current junta leader Prayuth, a significant advantage.
Al Jazeera American Scott Heidler, reported from Bangkok, said on Friday a clearer picture Preliminary results of various elections across the country are being released.
But he added, "The official results will be released no later than May 9th – so much can happen."
Unexpectedly, the Election Commission has delayed the publication of official results, and an Election Monitor is now spinning questions about electoral irregularities stating that the table is "deeply flawed."
Nearly two million invalid ballots, weak electoral outcomes, and electoral maltreatment may have wildly distorted initial numbers.
Al Jazeera and news agencies