Pacquiao had said four days ago that he and Khan's management were in discussions for the fight.
The protestors massed outside the national police headquarters where Senator Leila de Lima was detained on Friday.
The peso stayed at its lowest levels in a decade on Wednesday.
Not all kabayans are created equal.
De Lima referred to the mass uprising that ended the "iron fist" of Marcos's dictatorship in 1986.
Seven people suffered minor injuries in the fire that broke out Tuesday night then quickly spread.
Duterte's top aide, Christopher "Bong" Go posted images of their private breakfast meeting on his Facebook page.