Most of the 100 "experts" that the People's Democratic Reform Committee (PDRC) expects to sit on the council would likely share its anti-government views, said Mr Prompong.
He was commenting after Suthep Thaugsuban, the PDRC secretary-general and former Democrat Party power broker, briefed business groups on the People's Council plan. The PDRC envisions an assembly with 300 members selected by various occupational groups to be their representatives, and another 100 experts to be appointed by the committee to work on political reform.
The PDRC envisions the reform process taking 15 to 18 months before an election could be held.
"Having such a composition means that the public would not truly be involved in making decisions. Hence the 'People's Council' would be no different from a totalitarian or communist regime," the Pheu Thai spokesman said.
He said Mr Suthep's proposal to postpone the general election was not possible because His Majesty the King had already approved the royal decree to dissolve the House of Representatives and set Feb 2 as the election date.
If the People's Council is set up, the polls could be deferred by eight to 14 months, he added.