Abuja: Nigeria’s anti-corruption agency said Tuesday it was questioning opposition politician Nasir El-Rufai, a prominent critic of President Bola Tinubu.

The authorities launched court proceedings on Monday against El-Rufai, a former governor of Kaduna state, after he said on Nigerian television he had tapped the phone of Tinubu’s national security adviser.

Local media said he was being questioned about the alleged misuse of 432 billion naira ($319 million) during his stint as governor of Kaduna between 2015 and 2023.

He was summoned to the Economic and Financial Crimes Commission (EFCC) and appeared voluntarily, EFCC spokesman Dele Oyewale told AFP on Tuesday.

“He was invited and he honored the invitation,” Oyewale said. “He is being interviewed now.”