How the Enquirer Betrayed a Mafia Don and the Donald

The first person to testify in the first-ever criminal trial of an American president is the former publisher of the National Enquirer. But the supermarket tabloid might not have been around to “catch and kill” stories about Trump’s sexual liaisons if it were not for the early financial support of another notorious New York celebrity, the gangster Frank Costello.

And while Trump is not known for his grasp of history, he’d do well...