Dana White's catching some flak online after warmly greeting Andrew and Tristan Tate at a Power Slap event ... welcoming them back to the United States.

Controversial internet personality Andrew Tate finds himself embroiled in a disturbing criminal case, but that didn’t deter Dana White.

Ultimate Fighting Championship president and Donald Trump ally Dana White was seen at an event in Las Vegas on Friday warmly greeting Andrew and Tristan Tate, controversial right-wing influencers accused of human trafficking and other abuses across the U.S., the U.K., and Romania.

The Tate brothers — who are under criminal investigation in Florida and charged with human trafficking in Romania — attended UFC 313 and Power Slap 12 events.