The Washington Post for months has sought to confirm this report of a FISA warrant related to the Trump campaign but has been unable to do so. Presumably other U.S. news organizations have tried to do so as well. So one has to take this claim with a huge dose of skepticism. Indeed, the New York Times reported before the election that the FBI "ultimately concluded that there could be an innocuous explanation, like a marketing email or spam, for the computer contacts" with the Russian banks.