Then you can charge him with the crime of contempt, and allow that charge to be proven or disproven through actual due process.
There is no such thing as a valid reason to skip the part where you have to prove guilt. Even for a judge. Frankly especially for a judge. Everyone else has the excuse that they aren't lawyers. What's a judges excuse?
You can't prove or disprove anything with someone who refuses to comply with the courts. This is due process.
Per a different article, he pled guilty to the contempt charge: https://apnews.com/article/tommy-thompson-gold-coins-shipwre...