The Haaretz article stated:
"According to Democratic Senator Claire McCaskill, not a single committee meeting had been held on the threat posed by domestic terrorism, despite the fact that attacks carried out by white supremacists were "almost triple" those carried out by those who identify with a jihadist movement."
Maybe this is why the White House has not labeled the pipe bomb attacks as a domestic terrorist threat,
and CNN reported that "He[Trump] has no immediate plans to call this domestic terrorism (pending investigation), a White House official said."
No shock Trump refuses to attack the problem. My guess is as long as the attacks are directed towards liberals then there's no problem.