Prompted by a post I saw on Facebook about the "invaders" coming from the south....
noun: invader; plural noun: invaders
a person or group that invades a country, region, or other place.
attacker, aggressor, raider, marauder;
>an act or instance of invading or entering as an enemy, especially by an army.
>the entrance or advent of anything troublesome or harmful, as disease.
>entrance as if to take possession or overrun
In the broadest, non-harmful sense of the word, yes, it could be an invasion. But it sure hasn't been used in a more positive way. Perhaps we could say that we are being approached by a large number of people in need, running away from hate and fear and violence.
Like my grandparents from Russia/Ukraine in the early 20th Century?
Here's a video of this "dire threat."