Senate Parliamentarian Elizabeth MacDonough has previously knocked down Senate Democrats’ Plan A and Plan B immigration proposals in their draft versions of President Joe Biden’s $3.5 trillion “Build Back Better” spending program. What MacDonough recommends on the expected Plan C that Senate Democrats are preparing could determine whether America’s borders are opened to millions of new legal immigrants and a new mostly “open borders” immigration system is thus erected for the federal government. MacDonough—first appointed to the nonpartisan post in 2012 as the first woman ever to hold it—then is in the hot seat because Democrats are pushing the gargantuan Biden spending plan through Congress under its “reconciliation” process. They are doing so because reconciliation proposals need only 51 votes to pass the Senate instead of the usual 60. With the Senate split 50–50, Democrats must corral all of their caucus members to vote for the plan, the biggest, most …