UPDATE: NBC News is correcting its earlier reporting that federal agents wiretapped Michael Cohen's phone lines, now saying that agents were monitoring calls to and from Cohen via a pen register but were not listening in to what was being said.
From NBC News' Intelligence and National Security Reporter:
NBC News is reporting exclusively that federal agents wiretapped Michael Cohen's phones and picked up at least one call between one of those lines and the White House.
It is not clear how long the wiretap has been authorized, but NBC News has learned it was in place in the weeks leading up to the raids on Cohen's offices, hotel room, and home in early April, according to one person with direct knowledge.
At least one phone call between a phone line associated with Cohen and the White House was intercepted, the person said.
Previously, federal prosecutors in New York have said in court filings that they have conducted covert searches on multiple e-mail accounts maintained by Cohen.
(...)
After the raid, members of Trump's legal team advised the president not to speak to Cohen, according to a person familiar with the discussion.
Two sources close to Trump's newest attorney, Rudolph Giuliani, say he learned that days after the raid the president had made a call to Cohen, and told Trump never to call again out of concern the call was being recorded by prosecutors.
(...)
Former U.S. Attorney Chuck Rosenberg, now an NBC News analyst, says there's a high bar for having a wiretap approved.
"The affidavits are typically highly detailed and carefully vetted by experienced lawyers," he said. "In all cases the wiretap must be approved by a federal judge."
Rosenberg said that wiretaps are usually approved for an investigation into a current crime and not solely for possible crimes that have been committed in the past.
"This is an exacting process where the government must demonstrate to a federal judge that there is an ongoing crime."