MANILA - Detained Senator Leila de Lima is set to file a motion for reconsideration after the Supreme Court, voting 9-6, ruled against her plea to be released.

In a statement released Wednesday, De Lima, who is facing drug-related charges, said the high court's decision "legitimizes oppression and political persecution."

"The SC's majority decision tells us the extent to which Dutertism has distorted reason, suppressed the truth and rejected the primacy of conscience," she added.

• SC votes to keep De Lima in jail

The senator said she was deeply saddened by the dismissal of her petition as she was hoping that the Supreme Court would see that she was just a victim of "the President's deeply-rooted vengeance."

The 58-year-old De Lima, who is a vocal critic of President Rodrigo Duterte, is accused of accepting drug money from prisoners when she was justice secretary from 2010 and 2015.

"I had hoped that the justices who decided against my petition can feel the pain of someone who is sent to prison and yet is innocent of any crime, and has merely fallen victim to the strong arm of the State and the President’s deeply-rooted vengeance against her," she said.

De Lima has repeatedly denied accusations against her, claiming she had been locked up to stop her from criticizing the Duterte administration for the killings under the war on drugs.