"He did the right thing for himself, his family and the party," Trump said.
"I find him to be a very boring person and dull," Trump said.
His choice will definitely be a Republican, Trump says.
The CNN/ORC poll was completed before Trump's win in Indiana.
"She should not be allowed to run in the election," Trump said.
Niall Stanage 05/03/16 11:55 PM EDT
The results from the Hoosier State had deep resonance across both parties.
Sanders said there are states that still need to be heard from in the primary.
Sen. Elizabeth Warren went after Donald Trump on Twitter Tuesday night.
But he won't reach the 1,237 delegate threshold until June 7.
Democratic National Committee (DNC) Chairwoman Debbie Wasserman Schultz lashed out at the GOP on Tuesday night in the wake of Donald Trump...