MEXICO CITY—A Mexican court ruled on June 17 to allow the arrest of Emilio Lozoya, former CEO of state-owned oil company Pemex, who is facing corruption charges, according to a court document dated June 17 and seen by Reuters.

The decision nullified an earlier ruling that suspended an arrest warrant against Lozoya issued last month. “The suspension that had been granted is null and void,” the document said.

Mexican authorities say the case centers on bribes paid in connection with the purchase by Pemex of a fertilizer plant under the previous government. Reuters could not reach Lozoya for comment. He has always denied wrongdoing and defended the fertilizer factory purchase as a wise investment.

“I know perfectly well that he committed no crime,” one of Lozoya’s lawyers, Javier Coello, told local radio on June 17, vowing to fight the charges at trial.

The government’s move against Lozoya is one of Mexican President Andres Manuel Lopez Obrador’s boldest steps, since taking office in December, to fulfill a campaign promise to stamp out corruption.