Surely he knows this.
One wonders what is preventing such a statement?
He injected some hints early in the border speech but never expanded on the subject.
I think what we just witnessed is known in the kidnapping biz as “proof of life”.
Try the departure statement:
https://www.youtube.com/watch?v=dLExILbp6rg
and: https://www.youtube.com/watch?v=aLjfWxy2qjo
That’s not quite what you are looking for, I’m afraid, but does address the 1/6 events somewhat.