They knew McCain of course hates Trump and wanted him to lose. So in need of a useful idiot that was a Republican to get the Steele report over to the FBI to try to give their opposition research some legitimacy not as opposition research but as some objective independent investigation that could be introduced to the FBI by a Republican. Enter the useful idiot
The FIBers were all over the DOS-Yea! before Juan got all excited about Dumping Trump.
Piling on he wuz.