"Are there more things that we can do,...." - this is the portion of the sentence that necessitates the question mark.<quoted text>
Are there more things that we can do, whether it’s engaging in — engaging with communities where there’s a potential for self-radicalization at this — of this sort?
That looks like a question to me,
the symbol at the end
is a good clue.
You may see something different.
"where there's a potential for self-radicalization at this - OF THIS SORT?" (emphasis mine)- this portion of the sentence is clearly a conclusion - of that there is no question.