Multiple Client Certificates

We're working with an application that requires a specifc client certificate on an ipad to be able to log-in. It all works fine as long as there is only one certificate for that domain on the device but unfortunately there are several and the user is forced to choose.

Is there a way to request a specific certificate from the client rather than just asking for any?

HttpClientCertificate cert = Request.ClientCertificate;
    if (cert.IsPresent)
    {
        string ident = cert.Get("SUBJECTCN");