Democrats help Republicans
(magaimg.net)
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submitted by TheDonaldPodcast
To me, whistle blower has a positive connotation. The "whistle blower" here was a partisan hack that LIED about the contents of the call he didn't even hear. Other options are:
Brutus
Judas
backstabber
betrayer
defector
deserter
double agent
double-crosser
fink
informer
quisling
snake in the grass
snitch
spy
stool pigeon
treasonist
turncoat