Former President Donald Trump vowed to remain steadfast and confront “wickedness” without fear in a new message Sunday about the attempt on his life by a would-be assassin. “In this moment, it is more important than ever that we stand united and show our true character as Americans, remaining strong and determined and not allowing evil to win,” he wrote. In her first message on the attack, former first lady Melania Trump called the attack against her husband a “heinous act,” and decried a “tattered America.” When “I watched that violent bullet strike my husband, Donald, I realized my life and …