This question was closed with the answer "No" on 19 July 2016 with an end date of 15 July 2016. Donald Trump announced that Mike Pence would be his vice presidential running mate on 15 July 2016 (CNN, Boston Globe, NY Times). Mike Pence was not a former presidential candidate.
A number of Trump's previous rivals have been mentioned as potential picks for his vice presidential running-mate (Washington Post, NBC News). A list of the past Republican presidential candidates can be found at the NYTimes. Recommended Questions: Who will win the 2016 US presidential election? Which party will control the US Senate after the November 2016 election? Which party will control the US House of Representatives after the November 2016 election?