Laravel request not returning any data from Ajax post

I have a dependent dropdown, based on a previous selection, but the actual request doesn't appear to be sending any ID to the controller (to return data for the dependent dropdown).

When I select an option from the first dropdown, the Ajax request is triggered (I can see that the network request for the Ajax is correct):

http://ift.tt/2kU7a99

But it returns [].

Route:

Route::get('sites', 'AdminController@getSites')->name('getSites');

Method that returns the data:

public function getSites(Request $request)
 {
    $this->validate($request, [
        'trust_id' => 'required|numeric',
    ]);

    $trust_id = $request->get('$trust_id');
    $sites = Site::where('trust_id', $trust_id)->get(['id', 'name']);

    return $sites;
 }

If I hard code trust_id, it returns the correct data, but if I request the data, I always get null - http://ift.tt/2kU7a99

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