The Liberal Party on Saturday belied reports that Vice President Leni Robredo and its allies have conspired to launch "coordinated" attacks to discredit the administration of President Rodrigo Duterte.

Palace officials and Duterte's legislative allies earlier tagged Robredo and her party as the forces behind alleged destabilization plots against the chief executive after filing an impeachment complaint and a video criticizing extrajudicial killings made headlines on the same day.

House Speaker Pantaleon Alvarez said he is planning to file an impeachment complaint against Robredo over her video message against Duterte's war on drugs.

The accusations linking the vice president to destabilization plots and the so-called NagaLeaks that besmirch Robredo and her family are "baseless accusations" and "orchestrated lies that only harm the country," Liberal Party president Francis "Kiko" Pangilinan said in a statement.

Organizers of the United Nations meeting where Robredo's video was shown backed Pangilinan's claim, saying the vice president "had nothing to do" with the timing of the event.

"The date of our forum was scheduled months ago by UN staff, and the vice president's office did not make any requests of us as to timing or any other matters," David Borden, executive director of the Drug Reform Coordination Network, said.

Duterte's allies should stop "spooking themselves for no apparent reason," Pangilinan said.

They should focus on delivering the president's campaign promises such as putting an end to contractualization and solving traffic woes in the capital, he added.

• Read: Robredo, itinangging may kinalaman sa Duterte impeachment