This is ridiculous. How can someone get away with such a blatant form of plagiarism? And then to use PTSD as a reason as to why plagiarism might have happened is the perfect way to cheapen what others are going through. This kind of logic would be great if you needed to get out of a speeding ticket, and it would be about as effective. What a disgrace.
Senator John Walsh of Montana has a long, proud history of cutting corners and creating opportunities for himself. He is a combat veteran, and we should be grateful for his service. That doesn't mean he should be a United States Senator and he definitely has not earned a higher degree. There's a track record here and it cannot be ignored. No one should get a pass because of their party affiliation or their service.
At a minimum, he should resign and accept the academic discipline that goes with blatant plagiarism, which would include, I suspect, the withdrawal of the degree he was awarded.