Outright ban any federally protected group from access to their voting rights? No, and it would be instantly challenged and quickly rejected by the courts. As fucked up as it is now, the Supreme Court would also immediately reject that.

But that doesn’t mean they can’t engage in the kind of fuckery that’s entirely legal but definitely trends one way.

For example: felons can’t vote. So you investigate and prosecute a group more harshly and it just so happens that doing so sends a higher percentage of them to jail on felony charges than other groups. So you cow that group, suck up their money via lawyers’ fees and the loss of income when one parent is in jail that’s compounded by the difficulty getting a job afterward, and while it’s not a ban, and you do catch some people outside the group, it’s enough to tip the balance.

See: the crack epidemic versus ordinary cocaine.