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Former Defense Secretary Mark Esper joins The Lead.

Former U.S. Representative Will Hurd (R-TX) joins The Lead.

Today, CNN 10 heads to Iowa, where former President Donald Trump convincingly won that state's caucuses. We explain what the results mean and what's next as 2024 presidential candidates look to win their party's nomination. Then, we head to Iceland, where an erupting volcano threatens a small fishing town for the second time in less than a month. And before you go, we speak to a professor who gives us tips on how to turn New Year's resolutions into reality. All that and more on this episode of CNN 10.

European Commission President Ursula von der Leyen said the EU can find ways to support Ukraine even without Hungary's support.

NATO Secretary General Jens Stoltenberg said he's confident the U.S. Congress will provide more aid to Ukraine.    

The top daily photographs from the games of the globe and the people who play them.

CNN's Jomana Karadsheh reports on growing concerns in parts of the international community over the Israeli government's plans for Gaza once the war ends.

Christiane Amanpour speaks with Republican fundraiser Frank Lavin about the Iowa caucus results.

Christiane Amanpour speaks with Daniel Noboa about his steps to stem the gang violence in his country.

Republican presidential candidate Nikki Haley tells CNN's Dana Bash that the next debate she will participate in will either be against Donald Trump or Joe Biden.

Donald Trump's lawyer Alina Habba, who is representing him in the trial that will decide how much money in damages Trump must pay E. Jean Carroll for his 2019 defamatory statements about Carroll's sexual assault allegations against Trump, sparred with Judge Lewis Kaplan after he admonished Habba for repeating some arguments on issues he ruled on ahead of trial.

Ecuadorian President Daniel Noboa makes an appeal for equipment as his country wages war against the gangs he has labeled "terrorists."

CNN's Elizabeth Wagmeister breaks down the winners, losers and best moments of the evening.

CNN's Bianna Golodryga speaks with Rostylav Shurma, a senior advisor to Ukrainian President Zelensky.

GOP fundraiser Frank Lavin talks to Christiane Amanpour about Donald Trump's decisive victory in the Iowa caucuses.

Young and college-educated voters are "evaporating away" from the Republican Party, says former George W. Bush speechwriter David Frum.

When you think of race weekend in Abu Dhabi, Formula One comes to mind. But now there is a new sports competition in the United Arab Emirates' capital - SailGP.

Christiane Amanpour speaks with the U.N. Relief Chief Martin Griffiths about the humanitarian crises gripping Ukraine and Gaza and the importance of remembering our humanity.

A student from Colegio Pumahue Puerto Montt, in Chile, details his experience of learning about nature, and why it is important to pass on this knowledge.

Students from Instituto GayLussac, in Brazil, explain how they want to educate others on the importance of conserving marine life.