"Wala po akong duda na may kinalaman diyan ang ating Pangulo. Imposible po walang kinalaman dito ang ating Pangulo," she said.
"Pinag-usapan na nila ito, Plinano na nila ito. It was a done deal," she added.
De Lima initially walked out during Senator Alan Peter Cayetano's privilege speech today where the latter criticized last week's Senate hearing on extrajudicial killings.
After the speech, Senator Manny Pacquiao made a motion to declare the Senate's justice and human rights committee as vacant.
This led to a 16-4 ouster of De Lima who was replaced with Senator Richard Gordon, a Duterte ally.
Last week, De Lima brought in self-proclaimed Davao Death Squad member Edgar Matobato into the Senate.