Yup. Unfortunately, Trump is the only one mentioning this. The Stupid Party should be televising shock videos of opioid users. Then, maybe someone will pay attention and there might be interest in the Wall among the non-believers.
I have not heard Trump connect the Opioid situation to immigration or the Wall. They are unconnected.
The Opioid situation is 100% home grown by the swamp... by HHS, CMS, ACA, FDA, DEA ... by Corporatist Johnson & Johnson and the corporatist Joint Commission on Accreditation who all control what doctors and hospitals and medical and social service agencies must do.