PALM BEACH, Fla. — Former president Donald Trump threw himself back into politics this weekend by publicly endorsing a devoted and divisive acolyte in Arizona who has embraced his false election conspiracy theories and entertained the creation of a new “MAGA Party.” In a recorded phone call, he offered his “complete and total endorsement” for another term for Arizona state party chairwoman Kelli Ward, a lightning rod who has sparred with the state’s Republican governor, been condemned by the business community and overseen a recent flight in party registrations. She narrowly won reelection, by a margin of 51.5 percent to...