They said that the order may be illegal, as no political protest takes place and there is no sign that any upcoming protest would take a long time.
The ISA is enforced during August 1-10 for three districts in Bangkok.
Some of the senators are members of the Senate Committee on Corruption and Governance Promotion Studies. The committee plans to invite Deputy Prime Minister Niwatthumrong Boonsongpaisan for a testimony on August 8.
They noted that the public which is affected by the enforcement could file a petition to the Administrative Court.