As President-elect Donald Trump continues to shape his cabinet, the selection of Mike Waltz as incoming national security adviser gives me, the father of Itay Chen, a U.S. hostage being held in Gaza by Hamas, a renewed sense of hope. Waltz should bring the decisive policy changes that we, the families of those abducted by Hamas, have been begging for. My son Itay, along with six other U.S. citizens, has been held hostage since Oct. 7, 2023. Negotiations, pressure, and...