var obj = {
    "country" : "USA",
    "CApital" : "WDC",
    "President" : "Trump"
}

var myId =  obj.President;

this.newObj[myId] = {};

Object.each(obj, function(key, value) {
    this.newObj[myId][key] = value;
});

obj :{
    Trump :{
        "country" : "USA",
        "CApital" : "WDC",
        "President" : "Trump"
    }
}