A Clinton campaign press release about "Donald Trump's alarming closeness with the Kremlin" had me about to go write that if the right were attacking a Democratic presidential candidate along these lines, the cries of "McCarthyism" would be deafening. Then I saw the Nation editorial "Against Neo-McCarthyism," in which the Nation complains that " Over the past month alone, establishment voices like Franklin Foer, Paul Krugman, Jeffrey Goldberg, Josh Marshall, and Jonathan Chait, among others, have Kremlin-baited Trump in lieu of reasoned argument and factual critique."
The Nation editorial advises: "No one wishes to defeat Donald Trump more than The Nation. But to adopt the pernicious language of McCarthyism is to turn our backs on the best traditions of our country in favor of the worst."
"Trump versus the Republicans" or "Trump versus the Khans" is front-page New York Times news, but "Hillary Campaign's Neo-McCarthyism" somehow doesn't get picked up as a story in the mainstream press.
For a flavor of how the Clinton campaign has been pressing this case, here is a line from one of its releases: "While Clinton has stood up to Russia, Trump panders to Putin, and he and his campaign's far-reaching ties to the Kremlin cast serious doubt over his ability and desire to prioritize American national security interests as president."