How do I fix this? Passenger door rattles when leg isn't against it but doesn't when leg is against

Passenger door rattles when leg isn't against it but doesn't when leg is against. It doesn't take much. I literally just move my leg onto it and it stops. It's frustrating because I can hear the rattle while driving and can't stop it.

 

Pop the door card off, look for something rattling around in there and/or missing clips, replace the clips. Could also be the grab handle is loose or the power window assembly.