Scott...
First, let me mention something to refrain from doing. Something will either soak, or it won't. Sometimes folks dab a little water on a card to loosen something or wash something away, their thinking is that a little water might not hurt as much as a dousing. The result is a watermark, a wavy line, or several, showing where the damp met dry... so I don't think a partial soaking is much good.
Now for what to do. The piece with the newsprint on it has a torn corner. Where that tear meets the right edge there is a small amount of paper that juts up above the tear. If it were me, and I had no idea if that would soak or not, I'd tear off that little tiny piece and soak in in water for half a day or so. Then I'd attempt to blot it and dry it. If it soak ok, then I'd put that big piece in a big piece of Tupperware, a CLEAN baking sheet with raised edges, or something similar. I'd soak the entire piece for half an hour or so, then see how the newsprint is doing. I'd think it would loosen and separate from the bigger piece. It would soak to pieces eventually, so carefully fish it out if you're wanting to save the newsprint. That piece of newsprint is likely to have left an acidic mark on the big piece, unless it is really old newsprint. So it needs to come off of there. I'd change water a time or two, and rinse the thing off well. If much of a mark remains then that newsprint was acidic, might consider a pinch of baking soda in one of the water changes to buffer the acidity briefly, then another clean soak.
One way of thinking about that big piece is that the longer the newsprint stays attached, the more damage it will cause.
Hopefully it's on there with flour paste, so it will soak right off. It could be on there with some meaner material, that could be a problem.
Hope that helps. FW
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