Christie defends his attack against Rubio
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Chris Christie on Sunday morning defended his latest attack on GOP presidential rival Marco RubioMarco Antonio RubioOvernight Cybersecurity: Bipartisan bill aims to deter election interference | Russian hackers target Senate | House Intel panel subpoenas Bannon | DHS giving 'active defense' cyber tools to private sector Senators unveil bipartisan push to deter future election interference Puerto Rico's children need recovery funds MORE, saying the senator doesn't have the experience to be president.

"He's just simply not ready," Christie said on "Fox News Sunday." "He's a good guy but he is not ready to be president of the United States."

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Christie slammed Rubio in Saturday night's GOP debate as an inexperienced first-term senator.

The New Jersey governor said Sunday morning that he felt justified in his attack.

"I've been saying this for a long time and I don't think people have really listened," he said.

To be president, you need to be "tested," "prepared" and "experienced," Christie added.

"And quite frankly that's what I was trying to show the folks last night, that I am tested and prepared and ready," he said.

Christie also referred to President Barack Obama, saying the government is unraveling under his leadership.

"We don't need another on-the-job training in the White House," he said. "We need someone who's actually done this stuff and I've done it."

"I'm glad the American people are getting to see this before they make a mistake."