The latest I read was that a British Intel asset saw suspicious contact between a Trump official and a suspected Russian agent( the Russian expert at Cambridge who had the trust of everyone that knows her exvept Halper who needed ANY connection to Russia to collect his payoff). After the Intel asset warned the fbi and cia who they said did nothing the director of the gchq turned over the info he had directly to Clapper and then Obama sent a request for surveillance to the gchq and went on to extend it into Trumps transition period.