Sounds like something is rubbing on the rotor. we actually took tire off the front passenger and isolated the noise. thought it was the pads but that wasn't the case.

Most likely a backing plate it little bent just scoffing a rotor

You just need to have a mechanic or someone look at the front end. Has it been happening long enough to cause any odd tire wear on the tire? If the front end alignment is off, you could certainly get a lot more road noise, but even a badly worn tire would cause some noise.
If the tire is actually rubbing against something, and you hear it at 50 mph, that seems to indicate badly worn suspension parts- like ball joints or struts...so you should consider a good front end alignment shop and tell them the condition. They can check the tires and the front end as well. A reputable shop would check all that anyway, to make sure that the alignment job will actually keep the front end true.

Check for a stone or grit that has got lodged in between the disc and the back plate. Does this squealing stop when you apply the brake? if yes then remove the pads and chamfer the edge of the pads (take the sharp edge off the pads)

have your wheel bearings checked.

If the problem is as bad as it sounds, you may be close to parking it until fixed.
Normally, if you turn left, your are "loading" the right side, and visa-versa.
Think of it this way.
Picture a car going fast around a turn. The wheel on the inside of the turn might actually lift off of the ground, it is "unloaded".
With that thought in mind, look closely at the right front wheel. Start with the brake pads and /or rotor ( what the brake pads rub on to stop the car.)
Check the rotor inside and out. A good flashlight will do.
Pull the right front wheel and see if the pads are worn out or the rotor is no longer smooth, but "torn up" on the inside or the outside.
If the pads and the rotor is fine, next look at the wheel bearings.
This will be a bigger problem, probably a shop needs to check this out.

It sounds like the brake pads are metal to metal, when you turn the flexing of the wheel makes them touch the rotor and grind. This can rarely be caused by a badly worn wheel bearing as well, have both brakes and wheel bearing inspected.

It could be a lemon replacement hub or it could actually be the tire. Check the tires tread for irregular wear patterns. If the hub was loose prior to change this could easily cause the tire to wear in a "choppy" fashion which can also cause a rough humming sound that I have often heard customers refer to as a grinding sound.

yes, it could be, and probably is, to check this, jack the car up, and see if you can wiggle the tire, up and down, or side to side. also, you might want to check your brake pads. hope this helps!!!

Check that there is nothing rubbing on the axle further in from the calliper etc.

Check the condition of front disc brake pads, if they are in need of replacement a preset little metal arm starts rubbing the discs and will make a whining noise. It doesn't do any damage but it's irritating to listen to.