The Obama-era FISA warrant obtained to monitor the communications of Carter Page was most likely utilized as a gateway to spy on the rest of Donald Trump’s 2016 presidential campaign, contended William Binney, a former highly placed NSA official turned whistleblower. The same warrant against Page technically could also have been used to legally justify collecting data on the Republican National Committee (RNC) or the leadership of the Republican Party, Binney said. Binney was an architect of the NSA’s surveillance program. He became a famed whistleblower when he resigned on October 31, 2001 after spending more than 30 years with...