not a joke at all. It wasn’t an issue at all during the previous presidential campaigns.
That's because it didn't become a problem until the consequences of the 1965 Immigration Act began to be seen in the late 80s, combined with our appalling failure to guard our borders against illegals. Here's a great quote from Lawrence Auster:
"A country that lets in large numbers of immigrants of a different culture or race is not only giving away its national identity, but its national freedom, because once there is a large immigrant community with an identity distinct from that of the host society, they will deny the host country the right to restrict future immigration. And they will have the power to deny that right, so long as the host country itself has no real identity except for openness. But if the majority people of the host country begin to act as a group, just as the immigrants are acting like a group, then the immigration can be stopped, and the immigrants be made to behave."