There is no transcript of the interview but I listened to it. It is difficult to hear and understand, because Jake Tapper and Stephen Miller are interrupting each other constantly, and less than a minute later, Tapper ends the interview abruptly.
Starting at about the 8 minute mark of this highly contentious 12 minute interview, Miller says,
There's not a lot of coverage on this TV [station] talking about the
working class construction workers who have lost their jobs to foreign
labor. There is not a lot of coverage on this TV [station] about the
people getting slaughtered in sanctuary cities. You don't do a lot of
human interest stories about immigrant communities under siege from
from the MS-13.
Miller repeats a much less cogent version of that statement at the 11:15 minute mark, which is the passage quoted in the question.
Miller is referring to MS-13, an organized crime cartel from El Salvador and Honduras. Yes, there are communities in the United States that have experienced horrific violence from MS-13 gang members.
There are communities in
In some cases, the communities affected are immigrant communities. So in other words, both non-immigrant and legal immigrant communities are besieged by MS-13 criminals (who are illegal immigrants).
Note too that MS-13, or Mara Salvatrucha, was named a transnational criminal organization five years ago, and its origins go back twenty years, long before Trump or his immediate predecessors were in office.