Carly Fiorina on Wednesday sang onstage shortly after being announced as Republican candidate Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE’s running mate.

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In his speech, Cruz talked about how his family has gotten to know Fiorina on the campaign trail and told the crowd that she makes up songs for his daughters during their travels.

When she took the stage, Fiorina gave the audience a sample of her singing.

“I know two girls that I just adore,” she sang. “I’m so happy I can see them more. Because we travel on the bus all day, we get to play.”

Cruz formally announced Fiorina as his running mate at an event in Indianapolis Wednesday after much speculation.