Barack Obama says he’s decided on a running mate, but he won’t say who. "I’ve made the selection, that’s all you’re gonna get," Obama said told reporters while campaigning in Virginia Thursday. Obama didn’t say whether he’s informed his pick yet.

The Democratic presidential candidate told USA Today on Thursday that he went with someone who is independent and would challenge him in the White House. He also said he wanted someone who is prepared to be president and would help him strengthen the economy.

Obama is planning to announce his choice in a text message to supporters sometime before Saturday afternoon, when he’s scheduled to appear with his pick in Illinois.