Senators Antonio Trillanes and Vicente "Tito" Sotto III argued Thursday over a proposal to invite both the son and son-in-law of President Rodrigo Duterte to a Senate inquiry into the allegedly deep-seated corruption in the Bureau of Customs.

Trillanes said Davao City Vice Mayor Paolo Duterte and his brother-in-law, Atty. Mans Carpio, should answer allegations that they accepted millions of pesos in grease money to facilitate the questionable shipments of broker Mark Taguba.

Trillanes then accused Sotto of readily dismissing the allegations as hearsay and defending Duterte and Carpio.

"I heard the majority floor leader saying it's hearsay. Hindi ito korte ha, this is just an investigative body, we are just establishing the truth, fini-ferret out natin ang truth. Let them defend themselves. Huwag tayong mag-abogado sa kanila," he said.

Sotto, however, told Trillanes: "Hindi ako nag-aabogado. Ang sinabi ko, if you overheard me, pag-aralan muna ng committee sapagkat hearsay -- it doesn't mean na huwag. Huwag niyo akong pagbibintangan."

Watch a live streaming of the hearing here.