MANILA - A lawmaker will file a resolution calling for a Congressional investigation into the recent spate of alleged extra-judicial killings of drug suspects.

Ifugao Rep. Teddy Baguilat, a member of the Liberal Party, said he will file the resolution to ensure balance in the anti-crime campaign of President Rodrigo Duterte.

"To balance things, I think we do have to probe this allegation because one of the ultimate goals of our investigations is to professionalize the PNP," he said.

"Bakit ngayon lang parang intensified the drug campaign? Dahil ba sa marami ding mga pulis at pati mga politiko ang involved?" he said.

Baguilat also questioned why law enforcers seemingly intensified their operations against drug personalities only after President Duterte assumed office last week.

"If they had this information before, why was there no action? How reliable is this intelligence? If it is, ano na susunod na gagawin? Karamihan so far ng mga pinaslang o sinugpo ng kampanya ay mga taong mababa ang antas," he said.

Baguilat also claimed that Congressional oversight is needed to bolster the administration's anti-crime campaign through legal ways.

Meanwhile, other lawmakers also want to investigate five police officials accused by Duterte of being in league with drug lords.

READ: Duterte links 5 top cops to drug trade

Senator Sonny Angara said, "It should definitely be investigated because the prospect of having high ranking police officials in bed with the drug trade is truly, truly a horrific and frightening prospect."

Senator Joel Villanueva for his part encouraged government to file complaints against the generals.

"I assume the President's team has evidence against the generals. I also believe we should accord them due process. I urge them to file cases against them and tap the judicial system to address this issue ASAP," he said.

Quezon City Rep. Sonny Belmonte said Duterte may have solid evidence against the officials, and will take legal actions against them.

READ: Police officials tagged by Duterte in drugs face probe