Manila, April 23 -- A senator filed a resolution on Tuesday seeking to look into foreigners using falsified documents to pose as Filipinos, saying the country should be alarmed over such "disturbing patterns."

Senator Risa Hontiveros, also Deputy Minority Leader, said the probe would look into the presence of foreigners in areas critical to national defense, particularly in light of China's aggressive actions in the West Philippine Sea.

"It is only natural that we look into if this trend is, in any way, related to Chinese harassment in the West Philippine Sea," Hontiveros said, citing reports of a spike in Chinese enrollees with questionable entry credentials.

Proposed Senate Resolution No. 1001 also highlighted incidents involving for...