"The FBI and the Department of Homeland Security in May warned that white supremacist groups had already carried out more attacks than any other domestic extremist group over the past 16 years and were likely to carry out more attacks over the next year, according to an intelligence bulletin obtained by Foreign Policy."

http://foreignpolicy.com/2017/08/14/fbi-and-dhs-warned-of-growing-threat-from-white-supremacists-months-ago/

We should also note that less than two weeks after Trump took office, his administration moved to revamp a program called Countering Extremist Violence so that it would no longer address white supremacists and would focus solely on Muslims.
https://www.washingtonpost.com/blogs/plum-line/wp/2017/08/14/happy-hour-roundup-1174/