Dude, read the room. While in the Oval office to veto a bill that would void his declaration of a national emergency at the U.S.-Mexico border in order to pay for a wall he's used as a symbol of his anti-immigration platform, Trump was asked in light of the terrorist who attacked mosques in Christchurch, New Zealand who praised Trump as a symbol of white nationalism and murdered 49, injuring numerous more, in the name of anti-immigration if he thought white nationalism is a growing threat.
"I don't really. I think it's a small group of people that have very, very serious problems."
Ah, a small group, or cell, of people with radicalized ideologies who commit horrific acts of violence... So, terrorists. They're terrorists.
As far as I can tell, Trump has not referred to the attack as an act of terror or the attacker as a terrorist.
Just a reminder, Trump has declared himself a "nationalist."