The Biden administration is taking seriously a string of recent threats and sanctions from Iran against Trump administration officials around the two-year anniversary of the Jan. 3, 2020 strike that killed Iranian Gen. Qassem Soleimani. Iran’s actions may indicate Iran is plotting to assassinate the officials. On Saturday, Iran announced sanctions against 51 Americans, including Chairman of the Joint Chiefs of Staff Gen. Mark Milley as well as several individuals who worked with the Trump administration, like former United Nations Ambassador Nikki Haley and private military contractor Erik Prince. While sanctions typically yield economic punishment, current and former U.S. officials...