Move Forward leader Pita Limjaroenrat was seen greeting senior officials from five other parties at a Bangkok restaurant before ushering them upstairs for closed-door talks.

Sunday’s vote saw Move Forward come in first ahead of another opposition party, the political heavyweight Pheu Thai, in a major blow to the establishment’s pro-military parties led by Prime Minister Prayuth Chan-ocha.

Pita earlier this week said that together with five other opposition parties, his coalition will be able control about 310 seats in the 500-member House of Representatives.

The parties Pita has approached are Pheu Thai, Thai Sang Thai, Prachachart, Seri Ruam Thai and Fair parties.

Pheu Thai, which won the last five general elections but got pushed out of power each time, secured 141 seats, according to the latest projections, only 10
fewer than Move Forward.

However, a military-drafted constitution requires more than half of votes in a joint sitting of a bicameral legislature for him to become prime minister. He would need votes either from government parties or an unelected 250-member Senate who have a record of supporting Prayuth and conservative forces.

Analysts expect weeks to months of talks and dealmaking as parties jostle to form a government.

On Wednesday, some Thais questioned the senate’s role in electing a prime minister, asking ‘why do we need a senate’ on social media like Twitter.

Senior officials from Pheu Thai have urged other hold outs to support a Pita premiership.