Chris Chistie slammed fellow Republican presidential candidate Marco Rubio on Tuesday over the Florida senator’s shifting position on illegal immigration.

Appearing on “The Laura Ingraham Show,” Christie responded to a recent interview Rubio gave to Univision journalist Jorge Ramos, in which Rubio said he would not immediately revoke President Obama’s executive order granting effective amnesty to illegal aliens who came to the United States as children.

“It’s hard to keep up with how many times Marco changes his positions on these things, to tell you the truth,” Christie said. “I’ve said very clearly that the president’s conduct here is illegal … If these executive orders are lawless, which I believe they are, then they need to be revoked the first day in office.”

Christie said enforcing the law is any president’s No. 1 domestic responsibility.

“I don’t know why anyone would want to have someone who is not going to enforce the law as the chief law enforcement officer of the United States,” the New Jersey governor said. “You have to enforce the law.”

Ingraham asked Christie about large corporations that have imported foreign workers and required the laid-off Americans they replaced to train the replacements as a condition for severance payments. One of those employers, Toys R Us, is headquartered in Christie’s home state.

“It’s breathtaking,” he said. “And the fact is, we need to stand up for American workers in this country who have been suffering under this incredibly bad economic recovery under Barack Obama.”

Christie said a weak response by Republicans only emboldens Obama to act more brazenly.

“He just does whatever he feels like he’s gonnna do. And Congress has been impotent in trying to stop him,” he said.

Christies’s comments on immigration fit with a key theme of his campaign — that, as a former federal prosecutor, he will put law and order front and center.

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“Justice is not going to be just a word,” he said. “It is going to be a way of life for every person who works in my administration.”

Christie said former Florida Gov. Jeb Bush would do a “disservice to our country” if he spends millions of dollars on a slash-and-burn campaign to pull down rival candidates in a bid to rescue his own candidacy.

Asked about Bush’s claim that he was not aware of a leaked campaign document outlying a scorched earth strategy, Christie said: “If you’re a candidate and don’t know what your campaign is going to say, that’s a problem.”

Despite generally well-regarded debate performances, Christie has lagged far behind the pacesetters in the GOP presidential race. But he said he is biding his time, both with voters and donors, especially contributors who supported other candidates.

“I’ll be patient,” he said, recalling conversations with potential donors. “We don’t have to get married yet. We can just date.”