"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.
The businessman will take all 16 of the state's delegates.
Rhode Island offers 19 delegates on a proportional basis.
It’s still unclear how many of Connecticut’s 28 delegates he will take.
The businessman will win a majority of Maryland’s 38 delegates.