Early Friday Donald Trump tweeted that he has, in fact chosen Indiana Governor Mike Pence as his running mate.

"I am pleased to announce that I have chosen Governor Mike Pence as my Vice Presidential running mate. News conference tomorrow at 11:00 A.M."

I am pleased to announce that I have chosen Governor Mike Pence as my Vice Presidential running mate. News conference tomorrow at 11:00 A.M.

— Donald J. Trump (@realDonaldTrump)
July 15, 2016

This affirms Thursday's reports that Trump had chosen Pence.