He said this at a joint press conference with Lithuanian President Dalia Grybauskaite in Vilnius on Friday, an Ukrinform correspondent reports.
"I will not allow discrediting of the work of anti-corruption bodies," Poroshenko said, adding that he also opposes the discrediting of law enforcement agencies.
At the same time, he said that the leaders of anti-corruption bodies "should not play in the political field."
As Ukrinform reported, Poroshenko is on a visit to Lithuania on Friday.
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