Indiana Governor Mike Pence.
The Indianapolis Star confirmed the report, writing that Pence would be dropping out of his re-election bid to join the Trump campaign.
Pence served nearly four years as governor and 12 years in the House of Representatives. Choosing him as a Veep could reassure Republicans who have opposed Trump's presidential run. As The Indianapolis Star reported, Pence would "provide a disciplined counter to Trump's improvisational campaign style," and bring a "fundraising power and credibility on a wide range of policy issues that are important to conservatives."
The 57-year-old governor has been considered a favorite of those close to Trump, including his children and campaign manager Paul Manafort.
Trump will announce his decision at 11 a.m. on Friday in New York City. Pence wouldn't officially become the vice presidential nominee until the Republican National Convention next week.