WATCH: De Lima walks out of Senate probe on killings

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Senator Leila de Lima on Monday walked out of the Senate investigation on drug-related killings after a heated argument with Senator Richard Gordon.

The two senators went head to head on the issue of self-proclaimed hitman Edgar Matobato's kidnapping case.

According to Gordon, De Lima should have informed the committee of Matobato's case before hand. 

Gordon also got angry after he learned that Matobato has already left the venue.