don't be fooled by the media. Trump supports legal immigration and is allocating more quota to legal immigrants. As a result, tons of legal immigrants support Trump.
Trump has proposed eliminating many of the major existing categories of legal immigration in the core, family-owned action based system. He's proposed replacing the eliminated categories with a small number of renewable non-immigrant (no path to citizenship or work permission) visas for parents of US citizens.
He's proposed no concrete increase in total permanent allocation in the remaining categories, though he's talked about cancelling the diversity visa lottery and reallocating the quota used there to help clear backlogs elsewhere.
If I had to choose one, I'd prefer more employment visas over family visas and definitely diversity visas.
It appeases his nationalist base because it would not give visas to immigrants in low-paid jobs. Most of those voters were never in contention for the high-paying tech jobs anyway. They have no reason to care too much about them.
Overall immigration will decrease.