Don’t misunderstand Judge Aileen Cannon’s decision Friday to stick to the established May date of the Mar-a-Lago trial. Though it could be read as a defeat for former President Donald Trump, as he wanted to push the date back further, in fact the defendant has just won a partial victory for his top legal strategy — dragging out the cases against him until…

Legally, Donald Trump’s Jan. 6 election interference case and Hunter Biden’s gun charge case have more in common than you might think. Whatever the right outcome of each case should be, both cases illustrate exercises in prosecutorial discretion. The use and misuse of this discretion is worth studying. It can signal whether we live under…