The Texas senator had been teasing a "major announcement" all day.
The Susan B. Anthony List praised Fiorina ahead of the Cruz announcement.
Cruz has been teasing a major announcement for later Wednesday.
WH press secretary: "Apparently, the phonetics are not included on the teleprompter."
"The voters have spoken,” Rick Scott wrote on Facebook.
"Last night was Donald Trump's night, and today is Indiana's day," Cruz told reporters.
The speech comes one day after Trump swept five primaries in Northeast states.
"If he were any other candidate, that's exactly what everyone ... would be calling him."
Trump campaign manager Corey Lewandowski said there's no need to change his candidate's style.
Trump is pushing back against predictions he'll alter his campaign style.