Inspect server certificate using HttpClient

I'm rewriting some web handling code in WinForms and switching from HttpWebRequest to HttpClient. There's one last thing I require that I cannot seem to find out how to accomplish.

In HttpWebRequest, I can capture the certificate from the web server I'm connecting to and display it:

...
HttpWebRequest request = CreateHttpRequest(destUri);

HttpWebResponse response = (HttpWebResponse)request.GetResponse();

cert = request.ServicePoint.Certificate;

if (cert != null) 
{ 
  cert2 = new X509Certificate2(cert); 
  X509Certificate2UI.DisplayCertificate(cert2);
}
...

I cannot find the equivalent way capture the certificate using HttpClient:

//... Use HttpClient.
using (HttpClient client = new HttpClient())
{
  using (HttpResponseMessage response = await client.GetAsync(destUri))
  {
    using (HttpContent content = response.Content)
    {
      string result = await content.ReadAsStringAsync();
    }
  }
}

How/where can I do this here? I don't know how to get to the ServicePoint.Certificate.