He’s back, like Freddy Krueger in A Nightmare on Elm Street 5, and with a brand new book, Understanding Trump, his 28th or so, and hard on the heels of his two 2016 thrillers, Duplicity and Treason (written with Pete Earley). Newt Gingrich – one of the three amigos, along with fellow failed politicians Rudy Giuliani and Chris Christie, who hitched their wagons to the star from Queens during his campaign for president, all three desperately jockeying for the position of vice president or secretary of state, only to be spurned and humiliated – is back in the mix.