The newly proposed political entity called Bangsamoro can be created to replace existing Autonomous Region of Muslim Mindanao (ARMM) without amending the 1987 Constitution.
Senate President Juan Ponce Enrile emphasized the lack of need for Charter change since the government is not trying to create new territory to appease the Moro Islamic Liberation Front (MILF).
"This (framework agreement) is doable (without cha-cha) because there is no territory (proposed) except lands. Territory involves airspace and high seas," Enrile told reporters.
Enrile clarified that the framework agreement between the Aquino administration and MILF only proposes the "division of ARMM's territory" already in existence for Muslims in Mindanao.
The senate president issued the statement after Senator Miriam Defensor-Santiago said the framework agreement proposes to create a sub-state with a ministerial form of government.
"In the Bangsamoro area or region, there will not be a presidential form of government but a completely different form of government, the parliamentary form of government," Santiago said in a separate interview.
"The so-called substate will have power that the government exercises except external defense, security, foreign policy, monetary policy, citizenship and postal service," she added.
"Otherwise, it is a completely independent state," the senator noted.
But Enrile assured there will be no security concerns in creating Bangsamoro, which he claimed as a big improvement to the Tripoli Agreement that created ARMM.
"The way I understood it, this is a great improvement from MOA-AD (Memorandum of agreement on ancestral domain). I think we have to give it a chance and study it very carefully before we start shooting it down," Enrile said.
The senate president also did not see any security concern over the new proposal, which the Moro National Liberation Front (MNLF) has been opposed to.
He explained the MNLF should have no problem with the new framework agreement considering that it would integrate new areas in ARMM to create Bangsamoro.
He noted that President Benigno "Noynoy" Aquino III may issue an executive order to cover the transition period and ensure demobilization of rebel forces in ARMM.
"(But it is) subject to the modification that the Congress may introduce if that is warranted," Enrile noted.
The government created the ARMM in a bid to stop MNLF rebelsfrom waging a war in Mindanao during the Ramos administration.
But a break-away group used violence in its fight for an independent Islamic state, which seeks to legislate and enforce laws in accordance to Muslim beliefs.
In 2008, the Arroyo administration signed MOA-AD with MILF proposing the creation of a Bangsamoro "juridical entity," which the Supreme Court (SC) eventually declared unconstitutional.
On Sunday, President Benigno "Noynoy" Aquino III announced a breakthrough in the 15-year on-and-off peace talks with MILF with the framework agreement which will be signed next Monday.
Fourteen early winners in the party-list race have been named Friday even as the protracted count of votes continues.