OMG! These people are such idiots. Sean Spicer was reading a report made by Judge Napolitano two days ago.
Judge Nap: Obama 'Went Outside Chain of Command,' Used British Spy Agency to Surveil Trump
Knowing what the personnel at GCHQ are, it is quite possible that Americans stationed at the Cheltenham facility were tasked with surveillance of Trump and his campaign HQ in Trump Towers. Don’t forget that there are personnel from five nations located there. The British may deny they had anything to do with the surveillance, that doesn’t mean that the US. DNI, CIA, and other agencies located within the facility weren’t ordered to do the wiretapping and metadata surveillance. Plausible Deniability all the way.