Pence is slated to make a "significant announcement" on a radio show Friday.
The Indiana paper knocks both Trump and Cruz.
About 20 people were arrested after the event in Costa Mesa, Calif.
"Neither Hillary Clinton nor Donald Trump will fight the system, because they are the system."
"We’ll win places that a lot of people say you’re not going to win, that as a Republican you can’t win.”
Cruz said the attacks were another example of the GOP establishment targeting him.
" Obama understands that you build strong, tall, beautiful walls to keep people out who don't belong."
The event comes one day after Trump outlined his "America first" foreign policy in Washington.
But he said he would not be "a happy trigger," calling nuclear weapons "a horror."
The new VP pick bashed her opponents on both sides of the aisle.