5 Things to Know This Morning

— -- Your look at the five biggest and most buzz-worthy stories of the morning.

1. Idaho Big Game Hunters Defend Actions Amid Controversy About Cecil the Lion

Amid the backlash over Cecil the lion’s death, a second American doctor is now under fire for allegedly illegal lion hunting, but Idaho big game hunters Sabrina Corgatelli and Aaron Neilson strongly defended legal trophy hunting, saying it helps with conservation.

“I'm a passionate lion hunter, have been for 20 years,” Neilson told “Nightline” in a Skype interview from South Africa. “[People] think it’s about the trophy and being able to take this trophy home and mount it in our trophy room that is not what it’s about. It’s about the pursuit and the adventure of the hunt. That is why we hunt."

2. Memphis Cop Killing Suspect in Custody, Says He's 'Not a Coward': Officials

The man wanted for the fatal shooting of a Memphis, Tennessee, police officer has turned himself in, ending an intense two-day manhunt, police said.

Tremaine Wilbourn, 29, surrendered to the U.S. Marshals Office at the Memphis federal building with his family and an attorney, Memphis Police Department Director Toney Armstrong said.

"We have always been one step behind him or one step ahead of him," Armstrong said at a news conference. "I think he just felt the walls closing in on him."

3. 2 Dead, 22 Hurt in New Hampshire Tent Collapse

A man and a girl were killed and at least 22 people were injured Monday when a severe storm blew down a circus tent in northern New Hampshire, officials said.

State Fire Marshal William Degnan said at a briefing late Monday that the injured were taken to four regional hospitals. Their conditions were not immediately known.

The accident happened around 5:30 p.m. as the first of two scheduled shows was getting underway at the Lancaster fairgrounds, about 90 miles north of the state capital in Concord.

4. The First Republican Presidential Debate: Who's In, Who's Out

The first Republican Presidential debate is days away, but the question remains: who will be on stage and who will be watching from home?

Fox News, which is hosting the first debate this Thursday in Cleveland, says that they will include the top 10 candidates from an average of the five most recent national polls that are released before Tuesday at 5 p.m. But Fox News hasn't said which polls they will use to calculate their average, leaving the rest of us to play a guessing game.

With the addition of a new Monmouth University poll on Monday morning and a Fox News poll out Monday afternoon, an updated ABC News analysis of five recent national polls shows that John Kasich and Chris Christie are widening their lead over Rick Perry for the final two podiums, with the former Texas governor missing from the debate stage by 1.2 percent.

5. New York Air Guard Unit is Lifeline for Scientists in Greenland and Antarctica

Every year, a group of airmen from the New York Air National Guard embark on a unique mission to support science.

Since the mid-1970’s the 109th Airlift Wing has supported scientists logistically from around the world and brought them to remote locations in Greenland and Antarctica to conduct climate change research.

All of this is possible with a very special aircraft, the Lockheed LC-130, the largest plane in the world, which can land in snow and ice because it is equipped with skis.