You do realize there is a video out there of 46 saying we'd destroy Nordstream if the Russians invaded Ukraine? Right? Right????
If gas was still flowing to Europe at full volumes and Germany and others were refusing to go along with sanctions, I could see the possibility.
But with the flow already cut off, with all EU except authoritarian friendly Hungry on board with sanctions, with EU heading towards a full boycott of all Russian energy, with Russia itself turning off the flow in retaliation for sanctions, why at THIS point would the US take the risk of such an operation in NATO waters?