Christie ambushes Rubio in debate, seen as senator's worst performance so far

Republican presidential candidate, Sen. Marco Rubio, R-Fla., left, spars with Republican presidential candidate, New Jersey Gov. Chris Christie, right as Republican presidential candidate, businessman Donald Trump, Republican presidential candidate, Sen. Ted Cruz, R-Texas, and Republican presidential candidate, retired neurosurgeon Ben Carson listen during a Republican presidential primary debate hosted by ABC News at the St. Anselm College Saturday, Feb. 6, 2016, in Manchester, N.H. (AP Photo/David Goldman)

MANCHESTER, N.H. (AP) – Marco Rubio faced withering criticism of his readiness to be president and his policy depth in the last Republican debate before Tuesday's New Hampshire primary, as New Jersey Gov. Chris Christie and other candidates launched an aggressive campaign to slow the Florida senator's rise.

Rubio's responded with an uneven performance on Saturday night that could hurt his bid to emerge as an alternative to Donald Trump and Texas Sen. Ted Cruz. If anything, his showing gave new hope to Christie, Jeb Bush and Ohio Gov. John Kasich, all of whom need strong finishes in New Hampshire to keep their White House bids afloat.

Cruz, the Iowa caucuses winner, also took criticism at the debate for controversial political tactics, with one candidate disparaging him for having "Washington ethics" and being willing to test the campaign's legal limits.

New Hampshire's primary could further winnow an already shrinking GOP field or leave the primary muddled. Hard-fought, expensive and far-ranging, the campaign has become a fight for the future of the Republican Party, though the direction the GOP will ultimately take remains deeply uncertain.

Rubio, a first-term senator from Florida, has sought to appeal both to mainstream Republicans and those eager to upend the status quo. But his rivals, particularly Christie, have been blistering in their criticism of what they see as his slim qualifications to serve as commander-in-chief.

"You have not been involved in a consequential decision where you had to be held accountable," Christie said. "You just simply haven't."

Christie has built his closing argument around his criticism of Rubio, and he kept up that approach on the debate stage. He accused the senator of being a candidate governed by talking points — then pounced when the senator played into his hands by repeating multiple times what appeared to be a planned response to criticisms about his qualifications.

"That's what Washington D.C. does," Christie said. "The drive-by shot at the beginning with incorrect and incomplete information and then the memorized 25-second speech that is exactly what his advisers gave him."

Rubio wavered in defending his decision to walk away from the sweeping immigration bill he originally backed in the Senate — perhaps the legislation he's most closely associated with — and said he wouldn't pursue similar legislation as president.

"We can't get that legislation passed," Rubio said of the bill that would have provided a pathway to citizenship for millions of people in the United States illegally. The senator found his footing later in the debate when outlining his call for more aggressive action to fight the Islamic State and emphasizing his anti-abortion stance.

Cruz was the victor in Iowa, triumphing over billionaire Trump by drawing heavily on the support of evangelical voters. But he's faced criticism for messages his campaign sent to voters ahead of the caucuses saying rival Ben Carson — another favorite of religious conservatives — was dropping out and urging the retired neurosurgeon's supporters to back him instead.

Cruz apologized for his campaign's actions Saturday, but not before Carson jabbed him for having "Washington ethics."

Those ethics, he said, "say if it's legal, you do what you do to win."

Trump was back on the debate stage after skipping the last contest before the Iowa caucuses. After spending the past several days disputing his second-place finish in Iowa, he sought to refocus on the core messages of his campaign, including blocking Muslims from coming to the U.S. and deporting all people in the country illegally, all while maintaining he has the temperament to serve as president.

"When I came out, I hit immigration, I hit it very hard," Trump said. "Everybody said, 'Oh, the temperament,' because I talked about illegal immigration."

Kasich, who has staked his White House hopes on New Hampshire, offered a more moderate view on immigration, though one that's unpopular with many GOP primary voters. He said that if elected president, he would introduce legislation that would provide a pathway to legalization, though not citizenship, within his first 100 days in office.

The debate began shortly after North Korea defied international warnings and launched a long-range rocket that the United Nations and others call a cover for a banned test of technology for a missile that could strike the U.S. mainland.

Asked how he would respond to North Korea's provocations, Bush said he would authorize a pre-emptive strike against such rockets if it was necessary to keep America safe. Cruz demurred, saying he wouldn't speculate about how he'd handle the situation without a full intelligence briefing. And Trump said he'd rely on China to "quickly and surgically" handle North Korea.

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