Do Americans have any reason to trust the FBI? The once-vaunted reputation of the Federal Bureau of Investigation has been in tatters for years among conservatives — since well before its deep-state warfare against Donald Trump and his supporters became public knowledge. But a report this week about the bureau’s dealings with a man arrested in July in a potential Trump assassination plot linked to Iran just made things a good deal worse. According to Just the News, FBI counterterrorism agents interviewed Pakistani national Asif Raza Merchant in April when he landed at George Bush Internationa…