Sen. Miriam Defensor-Santiago:

"... [there is] the necessity to change from a unitary to a federal form of government, in order to solve the long-standing issue of Muslim separatism. ... But we have to be extremely careful that in a federal system, the Constitution shall prohibit absolutely any right of secession. The absence of such a prohibition might cause a civil war, as it did in the US."
October 4, 2008

"The Philippines is a tiny archipelago that has always been homogeneous, except for certain Muslim provinces. Federalism works only for regions or states that are heterogeneous."
February 13, 2008

"The federal solution may not only be appropriate, but also absolutely vital, to the problem posed by Muslim Mindanao."
May 25, 2000
BusinessWorld (Philippines)