Donald Trump is planning to announce that Indiana Gov. Mike Pence is his choice for his vice presidential running mate, according to a Republican with direct knowledge of the decision.

As Trump narrowed in on his choice of Pence, the two men spent time at both Trump’s golf resort in New Jersey in early July and at the Indiana governor’s mansion this week.

In addition to testing the men’s chemistry together, Trump was reportedly impressed with Pence’s calm demeanor, his experience on Capitol Hill and as a governor, and Pence’s potential to assist Trump in governing, should the ticket win in November.