The Democratic response to President Donald Trump’sjoint congressional address Tuesday was delivered by a first-term Michigan senator who built an extensive national security background before entering politics less than a decade ago. Elissa Slotkin gave the Democratic rebuttal to Trump just two months into her tenure in the U.S. Senate, having narrowly defeated Republican Mike Rogers to win an open seat in a presidential battleground state — despite Trump carrying the state. Senate Minority Leader Chuck Schumer, D-N.Y., praised Slotkin as “nothing short of a rising star in our party” when announcing her selection Thursday. Slotkin's spoke from Wyandotte, Michigan,...