A few things:

• This went out on their official twitter account.
• Riverside County GOP Chairman Scott Mann said he was "horrified" by the tweet

but

• He called it "nothing more than satire" earlier in the day, posted by a "volunteer".

Today's Republicans: hypocrites and abject liars.
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Source: LA Times

The Riverside County Republican Party tweeted out a picture of a shrouded hangman holding a noose, with a caption below saying, “I’m Ready for Hillary.”

According to the Riverside Press-Enterprise, the tweet was sent out by the county party’s official Twitter account at 2 p.m. Wednesday. The tweet has since been removed.

Riverside County GOP Chairman Scott Mann said he was "horrified" by the tweet, and promised to take action against the person responsible.

"I was made aware of derogatory tweet this afternoon toward Secretary Clinton when the Press-Enterprise called me for comment. I was horrified and had the tweet taken down immediately," Mann said in an email to the Times on Wednesday afternoon. "While some may think it was political satire, it clearly has no place in American political dialogue. As chairman of the Republican Party of Riverside County, I apologize to everyone and anyone who was offended by it."

According to the Press-Enterprise, Mann's response earlier in the day was much different. The paper reported that in an email he stated: “That meme is nothing more than political satire. It simply expresses how Ms. Clinton seemingly has gotten away with every scandal and political flip-flop in her public life — from classified email and Benghazi to her changing positions on healthcare, TPP, NAFTA, gay marriage, etc.”