Nothing brings people together like an external threat, real or perceived.

Rachel looked worried, more about me than any external threat.

Traditional security is about a state's ability to defend itself against external threats.

"Will people say a bad economy is a function of external threats?"

What we needed was a double threat, external and internal.

The land was at peace with no major external threats.

"I'd rather deal with an external threat than an internal one at this point."

May we know whether you have done so in response to external threats?

Since his nation was far less able to deal with external threats, it needed good intelligence more than ever.

The main reason to give federal aid to states is external threat.