Foster McTeague wrote: "Ah the proliferation of alternative facts in the Trump administration. They were given days to provide some factual basis, to find some corroborating evidence to support Trump's claim."
.
I'm not a fan of Trump or his team, but it's worth noting what Snowden said a while back, “I, sitting at my desk, could wiretap anyone, from you or your accountant, to a federal judge or even the president, if I had a personal email.”  Trump is not that far off base - just inarticulate and stupid.  The reality is, because of the way telephone data and Internet data is collected by the intelligence agencies there is no need, anymore, for a warrant or a "tap" to eavesdrop on individual domestic communications.  See for example:

"Rand Paul Is Right: NSA Routinely Monitors Americans’ Communications Without Warrants"
https://theintercept.com/2017/03/13/rand-paul-is-right-nsa-routinely-monitors-americans-communications-without-warrants/