CNN is reporting that last year, during the campaign, Paul Manafort was the target of a FISA warrant. The FISA warrant was active before and after the November election. President Trump and Manafort apparently continued to be in contact in the early part of 2017, when the warrant was still active.
From CNN …
The conversations between Manafort and Trump continued after the President took office, long after the FBI investigation into Manafort was publicly known, the sources told CNN. They went on until lawyers for the President and Manafort insisted that they stop, according to the sources.