This is a rather ridiculous statement. African Americans and Hispanics are just as American as Whites and they also respect the American constitution just as much as White Americans. If there is any group that needs to be monitored it's the (White and predominantly Trump-voting) deplorables in Kentucky/WV who live on benefits and marry off their underage children to some creep (or similarly reactionary Deep Southern welfare kings). I'm only talking about the actual reactionary deplorables who support child marriage. Most Kentuckians or West Virginians are very fine and hard-working people who got hit by something out of their control.
In Europe an increasingly diverse population could be a problem however. Western Europe has a lot of Muslims who don't really respect the constitutions (there also are a lot of Muslims who do respect European constitutions and who obviously are great citizens), the Muslim population is growing at a much faster rate than the White European population and Muslims generally are becoming more radical. At this stage Muslims are much more conservative on LGBT rights and women's rights than the most religious Whites (and not to mention the antisemitism). Still, the right-wing populists who suddenly care about women's rights and LGBT rights generally don't have a good record on these issues. I bet most European right-wing populists secretly yearn for the days when women stayed home, didn't have a career and obeyed the husband without asking questions.
Actually, at least in the US, Muslims are pretty close to where other moderate groups like catholics are on those issies.
Generally, American Muslims are professionals, many of them well-educated. That is (usually) not the case in Europe.
