Lt. Gen. (ret.) Michael T. Flynn, the National Security Adviser to President-elect Donald Trump. (AP)

After the radical Islamic terrorist attack in Nice, France, which killed 86 people and wounded 434 people, Lt. Gen. (ret.) Michael T. Flynn, now the National Security Adviser to President-elect Donald J. Trump, said he was "done" with trying to convince President Obama "to actually define this enemy" and added that the enemy is "radical Islamic terrorism," it is "on the march," and "this is a world war."

Lt. Gen. (ret.) Flynn, who served as the director of the Defense Intelligence Agency for two years in the Obama administration and in the U.S. Army for 32 years, was interviewed about the July 14, 2016 terrorist attacks on Fox's The Kelly File.

"These guys are so sophisticated," said Flynn in reference to the terrorists. "There's so savvy, and we are foolish. What we have not done -- and I'll stop here and get off my soapbox in a second. But what we have not done is we have not, from an international standpoint, we have not established an international set of strategic objectives to go after this very vicious, barbaric enemy."

"They have declared war on us," he said. "This is a world war. This is a world war."

“It's not like it was in the history books of World War II," said Flynn. "It may not feel like that, like tanks on the desert and, you know, and planes and ships at sea. But this is a world war. They've declared war on us. We must -- we must internationally, and we must create, I believe, a new 21st century alliance. But we have got to take the Arab Muslim world to task. The leaders in this world, that's who I want to see get up on the net tonight, get up on their soapbox like I'm on my soapbox right now and condemn this madness."

“And frankly, I'm sick of having, you know, just the Europeans and, frankly, our own, you know, leaders, you know, condemn it even though our own president -- I mean, like I said, I'm done trying to convince our president to actually define this enemy," said Flynn.

“We know what it is," he continued. "It's radical Islamic terrorism. They are vicious. They're barbaric. They are on the march. If you -- and I'm sorry, I'm on a roll here because I'm so just pissed and excuse my Irish."

"What we have just seen, and it's just unbelievable, untold amount of tragedy that is going on tonight," said Flynn. "And I keep harping back to what has happened in our country, in Orlando, in San Bernardino. I mean, people forget about 9/11. We in this country, we in this country, we can't think past Saturday night. We have got to start thinking much more strategically in this country. And I'm serious about this. I'm very serious about this."

Some of the victims of the radical Islamic terrorist attack in Nice, France, July 14, 2016. (AP)

"There are solutions to this," said the general. "There is no enemy that is undefeatable, and we should not fear this enemy. We should beat them, and I'm telling you we can beat them. We have proven it many, many times. When you have victory on the battlefield, you must sustain that victory, and we did not."

Lt. Gen. (ret.) Michael T. Flynn is President-elect Trump’s designated National Security Adviser.

Flynn, 57, is from Rhode Island. He grew up in a family of nine. He and his wife, Lori Flynn, have been married for 30-plus years. They have two sons and several grandchildren. Flynn served in the U.S. Army from 1981 to 2014 and served in Operation Iraqi Freedom, Operation Enduring Freedom, Operation Uphold Democracy and Operation Urgent Fury.