James Comey, the former FBI director who was fired by President Trump last month, is expected to tell a Senate committee that the president asked him to back off the investigation into Mike Flynn, a source told The Wall Street Journal on Wednesday.

The report said Comey could testify as early as next week.

The New York Times first reported that Comey in February wrote a memo that Trump had asked him to shut down the investigation into Flynn, the former national security adviser. The memo’s existence was confirmed by Fox News.

The memo reportedly said that Trump said to Comey that, “I hope you can let this go.” The president reportedly was referring to Comey’s FBI’s investigation into Flynn.