For all of these reasons, it's good to know what threats exist.

I'm telling you, based on all my years in the field of border security and national defense, that the threat exists.

Class 2, the letter said, "means that a significant threat to the public health or environment exists, and action is required."

For one thing, he could not be completely certain that either threat really existed.

This doesn't mean that the liberal threat does not exist.

We'll be keeping our eyes open even wider now that we know the threat exists.

An imminent threat to the life or physical safety of an individual exists.

Where no such threat exists a nation may freely use violence against another.

It was a man's business to protect a woman from what- ever threats existed, in whatever way he could.

"There is little actual evidence that a threat exists," the senior official said.