Carly Fiorina was spotted in Indianapolis on Wednesday amid reports that Republican presidential candidate Ted CruzRafael (Ted) Edward Cruz3 real problems Republicans need to address to win in 2020 The Hill's Morning Report - Trump on defense over economic jitters Democrats keen to take on Cornyn despite formidable challenges MORE will choose her as his running mate if he secures the GOP nomination.

Fiorina was spotted hours before the Texas senator’s scheduled rally there, at which he plans to make a “major announcement,” NBC News confirmed.

Fiorina’s arrival in Indiana continues to stoke rumors that Cruz will announce the former HP CEO and onetime GOP presidential candidate as his running mate, though the Texas senator refused to say what his announcement is about ahead of time.

The event follows reports this week that the Cruz campaign has been vetting Fiorina as a potential vice presidential candidate and that he could announce a running mate ahead of the convention.

Fiorina is a Cruz surrogate who frequently appears with the Texas senator on the campaign trail.

There’s also speculation that Indiana Gov. Mike Pence (R) — who has yet to endorse in his state’s primary with less than week to go — may lend his support to Cruz.

Cruz’s planned announcement comes one day after GOP front-runner Donald TrumpDonald John TrumpTrump pushes back on recent polling data, says internal numbers are 'strongest we've had so far' Illinois state lawmaker apologizes for photos depicting mock assassination of Trump Scaramucci assembling team of former Cabinet members to speak out against Trump MORE swept all five Northeastern primaries on Tuesday night.