The wiretapping denials seem to dwell on "I didn't authorize wiretaps". There are unknown intelligence agencies still leaking intelligence embarrassing to the Trump administration. I would guess that rogue spy groups did have taps on Trump, but left Obama himself with plausible deniability.

Plausible deniability aside, as a friend of mine pointed out elsewhere, the Democrats on the one hand are mocking Trump for the claim, but on the other have been clamouring for the FBI to investigate him for months (since before the election). Why is it so implausible that an investigation (or 7) was in fact launched?