Vice President Leni Robredo on Thursday tagged the Marcos family and its supporters as the possible masterminds of the impeachment case against her.

A lawyer associated with former President Ferdinand Marcos on Monday filed an impeachment complaint against Robredo for her criticism of the administration's bloody war on drugs.

In a letter addressed to House Speaker Pantaleon Alvarez, Lozano and another Marcos supporter, Melchor Chavez, said Robredo "committed acts of injustice" when she spread "fake news" about the Philippines to the world when she sent a video to the United Nations Commission on Narcotic Drugs meeting (CND) last week, criticizing the government’s war on drugs.

Another group called "Impeach Leni Team" is set to file a second impeachment bid against Robredo once session resumes in May.

"Mahirap po yata talagang kalaban yung mga Marcos... Parang dinadamay yung buong bansa dahil ayaw tanggapin yung pagkatalo," Robredo said alluding to her election victory against former senator Bongbong Marcos.

Marcos lost to Robredo in the May 2016 vice presidential race by 263,473 votes.

Marcos' camp has filed an election protest against Robredo alleging that there was massive vote-buying, pre-shading of ballots, pre-loaded secure digital cards, misreading of ballots, malfunctioning vote counting machines, and a script change in the transparency server that allegedly altered the results in the VP race.

Robredo said she has been battered by criticisms and allegations after she defeated the Ilocano solon for the second highest position in the country.

"Siguro kung hindi Marcos yung kalaban natin, hindi ganito kagulo," she said.

--- with reports from Zhander Cayabyab, DZMM.