I'm pretty sure that's this article that says:It does say there was surveillance, but it doesn't say any Trump associates were the targets or anything about Trump tower.
Perzactly. The implied statement being "We were spying on/wiretapping/listening in on/intercepting/etc. the calls made by the Russians. Now, it has come out that they were wiretapping Trump Tower, which is a fish of entirely different plumage.
And yes, it is like Watergate. Wiretapping the phones of political opponents crosses that line.
Which explains the constant implication of "Russia hacked the election". Since they couldn't show any collusion between Trump (et al) and Russia, they could only imply it. and since Hillary losing was a complete surprise the hacking story actually gained traction among the low-information voters/disaffected lefties. Plus the Goebbels effect of repeating the lie, to discredit and delegitimize the Trump administration.
Now it's blowing up in their face. And it couldn't happen to a nicer bunch. This will merely serve to drive more voters to Trump (if they can fix the abortion of a Healthcare "replacement" bill)....