Thai nationalists, known as "yellow- shirt" voiced opposition to the enforcement of special security law in seven districts in Bangkok, Bangkok Post online reported on Tuesday.
Puea Thai spokesman Prompong Nopparit said the imposition of the special law would cause problems for both the yellow-shirt People's Alliance for Democracy (PAD) and the anti-government red- shirt camp associated with Puea Thai Party.
The Cabinet on Tuesday approved the police's proposal to impose the Chapter two of Internal Security Act (ISA) in seven districts in the capital from Feb. 9 - 23, in an effort to better control the situation around key government compounds.
This chapter in the legislation will allow authorities to bar any person to enter the protest site and impose curfew.
Puea Thai spokesman said the imposition of the law may pave the way for the Government to reinforce the State of Emergency Decree again.
"This is not the right way of solving the problem. The protest can be kept under control with ordinary laws," Bangkok Post online quoted the spokesman as saying.
Thai Cabinet in December last year lifted the Emergency Decree in Bangkok and four surrounding provinces after they were kept under the decree since March last year in the wake of anti- government "red-shirt" protest.
The Emergency Decree, giving the authorities more power than the ISA, prohibits assembly of more than five, allows the government to shut down media and detain suspects without charges for up to 30 days.
Meanwhile, Prapan Khoonmee and Panthep Puapongpan of the PAD said the PAD's legal team would petition the Administrative Court to order the government to revoke the order.
The PAD would also file a lawsuit against the entire cabinet because it is the people's right under the constitution to hold a public gathering, Prapan said.
The PAD plans to hold a mass rally on Friday to demand Prime Minister Abhisit Vejjajiva to resign from his post after his government failed to meet the PAD's demands concerning the handling of the border dispute with Cambodia.
They are calling on Abhisit to revoke a pact with Cambodia on settling a land row.