Democrats are increasingly antsy over the lineup President-elect Donald Trump has announced for his Cabinet, but they are also powerless to do very much to stop him — thanks to their own leader, Sen. Harry Reid. It’s unlikely Mr. Reid had a President Trump in mind when he pulled the so-called “nuclear option” trigger three years ago, changing Senate rules to eviscerate the use of a filibuster to block presidential nominees. Set up to help President Obama’s picks overcome GOP opposition, those same rules now will clear the path for Sen. Jeff Sessions to become the new attorney general, Rep....