ROGER SIMON: Mukasey Oped Should Strike Fear in Democrats.

The definitive answer to the obvious question—what’s that about?—is known only to Mr. Durham and his colleagues. But publicly available reports, including by Andrew McCarthy in his new book, “Ball of Collusion,” suggest that during the 2016 campaign the Federal Bureau of Investigation tried to get evidence from Ukrainian government officials against Mr. Trump’s campaign manager, Paul Manafort, to pressure him into cooperating against Mr. Trump. When you grope through the miasma of Slavic names and follow the daisy chain of related people and entities, it appears that Ukrainian officials who backed the Clinton campaign provided information that generated the investigation of Mr. Manafort—acts that one Ukrainian court has said violated Ukrainian law and “led to interference in the electoral processes of the United States in 2016 and harmed the interests of Ukraine as a state.”

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