Ronald Reagan gave this basic speech several times:

Cannot swords be turned to plowshares? Can we and all nations not live in peace? In our obsession with antagonisms of the moment, we often forget how much unites all the members of humanity. Perhaps we need some outside, universal threat to make us recognize this common bond. I occasionally think how quickly our differences worldwide would vanish if we were facing an alien threat from outside this world. And yet, I ask you, is not an alien force already among us?

Speech to the United Nations General Assembly, 42nd General Assembly September 21, 1987

Now, I never cared for Ronald Reagan. At the time, the general sentiment among people like me about Reagan generally and this speech particularly was similar in kind, but by no means degree, to our thinking about the idiotic behavior of our current leader.

But I have to say, at the time I agreed with him; and I have always wondered if he was right. We will see.

Here are clips of the three speeches on You Tube