Gov. Mike Pence is dropping his re-election bid in Indiana to become Donald Trump's running mate.

IndyStar has confirmed that Trump plans to announce Pence as his selection for vice president, ending a weeks-long vice presidential casting call during which Trump vetted a handful of high-profile Republicans.

Trump's national campaign spokeswoman, Hope Hicks, said "a decision has not been made." A formal announcement is scheduled for 11 a.m. Friday in Manhattan.

The long-awaited decision upends the political landscape in Indiana and at least partially remakes the Trump campaign in Pence's image.

In Pence, Trump has added a social conservative who GOP strategists say will reassure rank-and-file Republicans that Trump can be trusted to pursue their interests. Veteran political observers say Pence, a former U.S. House member and chairman of the House Republican Conference, will provide a disciplined counter to Trump's improvisational campaign style. Pence also brings fundraising power and credibility on a wide range of policy issues that are important to conservatives.