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MANILA - The commissioner of the Presidential Anti-Corruption Commission said Monday he only issued a "warning" against Vice President Leni Robredo that an impeachment complaint may be filed against her for supporting a United Nations resolution seeking to review the drug war.

PACC commissioner Atty. Manuelito Luna said he does not intend to file any impeachment complaint against Robredo.

"It’s a warning so she can also think it over, that she has to temper her statements. Although I respect her, she’s a politician, she’s a lawyer like me but she has to temper her statements," Luna told ANC's Early Edition.

"Do not embarrass our government internationally. You can always ventilate matters within and we can debate all day, all night without accusing our government of wrongdoings without substantial basis."

Robredo, in an interview with radio DZMM last week, said she would welcome UN investigators when their review on the alleged human-rights violations starts.

The Vice President's statement was a "betrayal of public trust," Luna said.

"I cannot sit idly by while our Vice President is lambasting our government, taking a position different from our President and says that it’s okay and making it appear that the government is into human rights abuses. That’s some bullshit. Excuse me for my words," he said.

Some groups have expressed an interest in filing an impeachment complaint against Robredo, according to Luna, who said he will not "meddle" with the process.

Robredo's spokesman on Sunday said the Vice President is willing to face any impeachment call.

The Iceland-initiated resolution was approved by the UN Human Rights Commission on Thursday, with 18 countries voting yes, 14 opposing it and 15 abstention.

President Rodrigo Duterte criticized Iceland for endorsing the resolution, saying the Nordic island nation does not understand problems faced by Manila.