The latest target of the Trump administration is one of the world’s most influential foundations, funded by one of the right wing’s foremost boogeymen: George Soros. Mr. Soros, a hedge fund billionaire who was born in Hungary, has, over the last four decades, built a sprawling political and philanthropic empire that seeks to advance a liberal, democratic agenda around the globe. On Thursday, The New York Times reported that the Justice Department was pushing for a federal investigation of the central entity founded by Mr. Soros, the Open Society Foundations, on the purported grounds that Mr. Soros had been fomenting...