It did not start 8 years ago.
I am old enough to remember better. It has been growing for most of my adult life, about 40 years. But it really seemed to take off in the late 90's. That's when Gingrich and the Contract with America and all that made partisan politics more important than the good of the country. It isn't that Democrats have never done that, of course they have. But the GOP was always out in front of that race.
To get back to your OP. There was already a steady stream of undocumented workers and factories going overseas in 2000. But they became a flood during the Bush administration. Illegal immigrants fell under Obama. Not because he was any magician, but the Republican Recession of 2007/8 caused a drop in employment and the illegal workers lost a lot of jobs and left. So your premise in the OP is demonstrably wrong.
It isn't Obama or leftists who want to give jobs to nonUSA citizens. It's capitalists. They don't want to pay an American $20/hr when somebody else will do it cheaper. And since American consumers will buy the cheapest option, even if it costs American jobs, producers will keep giving the jobs to foreign workers.
Trump is not going to change that. Quite the contrary, it would be very "bad for business" if he did. So I see less reason for Trump and the Republican dominated Capitol Hill to do it than for Obama to end the wars in Iraq and Afghanistan (which he didn't do either) .
Tom
