On Saturday night former Secretary of State Hillary Clinton, Vermont Sen. Bernie Sanders and former Maryland Gov. Martin O'Malley gathered in New Hampshire for the final democratic presidential debate of the year.

The wide-ranging debate was held at St. Anselm College in Manchester, New Hampshire, and hosted by ABC News. Candidates focused on foreign policy issues, the terror threat, gun control and the economy.

Check out some of the night's highlights:

Clinton - Trump is 'ISIS' best recruiter'

Clinton, the democratic front-runner, took multiple jabs at GOP-front-runner Donald Trump. Among the most memorable, Clinton warned Trump's message has made the business mogul "ISIS' best recruiter."

"A lot of people are understandably reacting out of fear and anxiety about what they're seeing ... and Mr. Trump has a great capacity to use bluster and bigotry to inflame people and to make them think there are easy answers to very complex questions," Clinton said.

"We also need to make sure that the really discriminatory messages that Trump is sending around the world don't fall on receptive ears. He is becoming ISIS' best recruiter. They are going to people showing videos of Donald Trump insulting Islam and Muslims in order to recruit more radical jihadists."

She didn't back up her claim with any specifics.

Sanders apologizes to Clinton after data breach

Sanders apologized to Clinton one day after news broke that a Sanders campaign staffer wrongfully reviewed voter files compiled by the Clinton campaign.

"As soon as we learned that they looked at that information, we fired that person," Sanders said. Officials have since launched an internal investigation to determine whether any other staff members reviewed the documentation. It was accidentally released to Sanders' campaign through a glitch in the system used by the democrats to organize voter data.

"Does Secretary Clinton deserve an apology tonight?" asked moderator David Muir.

"Yes, I apologize," Sanders responded. "Not only do I apologize to Secretary Clinton ... I want to apologize to my supporters. This is not the type of campaign that we run."

For her part, Clinton accepted the apology.

"I don't think the American people are all that interested in this," she said. "I think they're more interested in what we have to say about all the big issues facing us."

Sanders: Muslim-majority states must do more in battle against ISIS

Sanders called for Muslim-majority countries to put more weight into the fight against Islamic extremism.

"I agree, as I mentioned a moment ago, with King Abdullah: this is a war for the soul of Islam," Sanders said. "My plan is to ... tell Saudi Arabia that instead of going to war in Yemen they, one of the wealthiest countries on Earth, are going to have to go to war against ISIS. Tell Qatar instead of spending $200 billion on the world cup maybe they should pay attention to ISIS, which is at their doorstep."

He said a well-coordinated, international effort could be used to battle extremism but emphasized his belief that America keep boots off the ground.

"They should be Muslim troops," he said.

O'Malley slams Clinton, Sanders for 'flip-flopping' on gun control

Over protests from Clinton and Sanders, O'Malley painted himself as the only candidate to consistently stand strong on the issue of gun control.

"This is one of those issues that separates us on this stage," O'Malley said as moderators attempted to cut him off. "I am the only person on this stage who has actually passed comprehensive gun safety regulations with a ban on combat assault weapons."

He said the issue highlighted "profound differences" in the candidates running for the democratic presidential nomination.

"When ISIL does training videos that say the easiest way to get a combat assault weapon in the United State of America is at a gun show then we all need to be waking up," he said. "It's because of the flip-flopping, political approach of Washington that both of my two colleagues on this stage have represented there for the last 40 years."
Sanders and Clinton were quick to respond, with the senator from Vermont quickly speaking up.

"Let's calm down a little bit Martin," Sanders said.

"Yeah, let's tell the truth," Clinton chimed in.

Clinton nods to 'Star Wars' fans in closing statements

Comfortable in her lead over Sanders and O'Malley, Clinton took the opportunity to nod at "Star Wars" fans in her closing statements.

"Thank you, good night and may the force be with you," she said.

The latest installment of the series, "Star Wars: The Force Awakens" opened to great fanfare on Friday.