Former U.S. Attorney General Eric Holder tweeted a message early Friday for FBI and Department of Justice employees that was as vague as it was clear: Be prepared. Be strong.

Holder addressed his warning and encouragement to the “career men and women” in the FBI and DOJ, saying, "Your actions and integrity will be unfairly questioned. Be prepared, be strong. Duty. Honor. Country."

To the career men & women at DOJ/FBI: your actions and integrity will be unfairly questioned. Be prepared, be strong. Duty. Honor. Country. — Eric Holder (@EricHolder) June 30, 2017

Holder did not provide any other context to the meaning behind the tweet or say what prompted him to post the message.