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So much for that endorsement.

Martin Shkreli, the reviled former pharmaceutical CEO who once raised the price of an HIV drug by 5,000%, reneged his apparent endorsement of presumptive Republican nominee Donald Trump late Monday, saying he plans to abstain from voting for "crap candidates" in November.

Read more: Pharma Bro Martin Shkreli Just Endorsed (You Guessed It) Donald Trump

Shkreli, nicknamed "Pharma Bro," had endorsed Trump last Thursday in a tweet, despite Trump once calling Shkreli a "disgrace" and a "spoiled brat."

"I haven't been called by the Trump camp. I support him vs. Hillary," Trump tweeted. "He should find a VP candidate who is seasoned in politics, an ugly game."

It's unlikely that the Trump campaign is losing sleep over Shkreli's reneged endorsement. Shkreli — who's also earned the title of "the most hated man in America" — is currently awaiting trial on federal securities fraud charges.