I'm very curious to know more (been fascinated with .MIL / Security, etc. my entire life) but here's my understanding:

• Trump absolutely still has a significant - if not full-size - US Secret Service Security Detail. Full-size meaning the same as any prior actively SITTING POTUS.

• USSS years ago developed their own CAT; Counter Assault Team, which is USSS SWAT.

• It is common for Tier 1 units to provide added security for POTUS, but I believe that's mostly when he travels internationally or during any time of elevated threat.

Tier 1 = CAG, SEALs, Force Recon, etc.

I think it is mostly CAG (Delta) and SEALs who provide extra security; not heard too much about Marine Force Recon (Special Forces) doing presidential security, but I have no clue. :-)