Criticism continued unabated after the National Legislative Assembly (NLA) voted to hold off on the enforcement of an organic bill on elections of MPs for 90 days after being published in the Royal Gazette.
Politicians suspect the NLA decided to extend the deadline for organising national polls at the urging of the regime and believe the government could face pressure or even resistance over the move.
Democrat Party leader Abhisit Vejjajiva on Saturday called on the National Council for Peace and Order (NCPO) to come clean if it was not ready to organise a general election.
"If the NCPO wants to postpone the election, it should tell the public upfront, otherwise this will undermine its credibility," he said.
Mr Abhisit also cast doubt over the regime's insistence that it hadn't meddled with the NLA's deliberations.
He pointed out that despite claims of non-interference, the NCPO chief issued a Section 44 order to amend parts of an organic draft law on political parties to extend the deadlines for reviewing parties' membership databases, a step which precedes the primary votes the parties must arrange to find the candidates they will field in the next general election.
Mr Abhisit said the government will face growing pressure from the international community following the NLA's vote on Thursday which will likely see the election pushed back at least until February 2019.
According to the constitution, an election must be held within 150 days of the four election-related laws being promulgated. The election had been tentatively scheduled for November under the original roadmap.
Worachai Hema, a former Pheu Thai MP for Samut Prakan, said Prime Minister Prayut Chan-o-cha's words can no longer be trusted.
He warned of a possible popular uprising breaking out to demand Gen Prayut keep his promise of a November election.
The Pheu Thai politician said the election has already been postponed several times and the regime had this time exploited a technicality surrounding the NLA's consideration of the draft organic law.
Mr Worachai said he was concerned the NLA's vote to delay the enforcement of the organic law on MP election could lead to the demise of the regime and the other coup-installed bodies known as the "five rivers".
"The people might not tolerate this and come out to demand a return of their power. The NLA's decision may have spelled doom for the so-called five rivers," he said.
Meanwhile, the NCPO stressed yesterday the delayed enforcement of the election law was not enacted for its own gain, but for the good of the country and the people.
Maj Gen Piyapong Klinpan, an NCPO spokesman, said the 90-day period was to allow political parties and authorities concerned enough time to make proper preparations for the polls.
"This is not in the NCPO's interest. It is the people and the country who will benefit from [the delayed enforcement of the organic law]," he said.
He also played down calls by the US and the EU for the regime to stick to the election timetable, saying he believed the envoys understood the situation.