"The whole thing is about winning," he said.
A man whose son was killed took the podium shortly after Trump came onstage.
"I love California. I love this state," he said.
The senator is cutting about $200,000 from its initial buy in the state.
The ad attacks Cruz for his support of "bad trade deals."
The Ohio governor compared Trump to a car crash.
Democratic presidential candidate Bernie Sanders has requested an extension for filing his personal financial disclosure report, which would delay the filing until after the final Democratic primary votes are cast.
The poll finds that Trump and Clinton are tied at 38 percent each.
“For many Americans, the term ‘America First’ will always be associated with and tainted by this history."
Cruz comes in second even after he planned to cede the state to Kasich.