Kimberly Guilfoyle is the current U.S. ambassador to Greece and a longtime cheerleader for President Trump. She is also a former Fox News personality, long-ago ex-wife of Gov. Gavin Newsom (D-Calif.), and, more recently, ex-girlfriend of Donald Trump Jr. And she's for sale. The Wall Street Journal has the receipts: Guilfoyle promised Eric Deters, a quixotic...