Officials from Ukraine's anti-corruption unit were reported to have searched Kravchenko's office over the weekend in connection with an investigation into illegal so-called call centres.
The two anti-corruption investigative units, Nabu and Sapo, said this weekend that they had uncovered money-laundering activities with links to the Attorney General's Office. The activities allegedly included laundering money from criminal activity using fake phone calls.
Corruption is widespread in Ukraine, where several associates of President Volodymyr Zelenskyy have been investigated.
Kravchenko denied the allegations of wrongdoing in a statement on Sunday.
