The rise of outsider candidates such as Trump and Sen. Ted Cruz, R-Texas, reveals Americans’ frustration with government that has been escalating for years, Giuliani said. He said the declining approval ratings of Congress should make it no surprise.

“I think they’ve actually come to the point where they blame it on both parties,” he said of American voters. “When a person like a Trump comes along or, to some extent Cruz, who has made himself sort of an outsider [candidate], I think it’s very appealing. That is a real sentiment that is very, very powerful, very strong.”

Though he has been an unapologetic critic of President Barack Obama, Giuliani said he believes the president has an “appreciation” of the dangers of cyberattacks. And he called the president “a good man, an honest man — I just think on policies he’s mostly wrong.”