Republican presidential candidate Ted Cruz has announced Carly Fiorina as his running mate, calling her a “consistent, courageous fighter”.
The former presidential candidate is the former CEO of technology company Hewlett-Packard.
Mrs Fiorina dropped out of the presidential race after a poor showing at the New Hampshire primary.
She has been an active supporter for Mr Cruz, a senator from Texas, on the campaign trail.
The early announcement is unusual because vice-presidential picks are not normally decided until after a candidate secures the nomination.
Mr Cruz alluded to this exchange in introducing Mrs Fiorina in Indiana, saying she handled it with “grace and class”.
While at Hewlett-Packard, Mrs Fiorina laid off 30,000 people and was fired by the company’s board, though she has argued that her leadership “saved” the company.
She also had a failed bid for a California Senate seat.
Donald Trump’s son Eric Trump called the move desperate.
While addressing the crowd, Mrs Fiorina broke into song.
She sang about Mr Cruz’s daughters and their times together on the Cruz campaign bus.
“Donald Trump and Hillary Clinton are two sides of the same coin,” she said, and Mr Cruz’s presidential bid is not over yet, despite what “the media says”.