WASHINGTON — House Republicans have held it over Homeland Security Secretary Alejandro Mayorkas for months. Attorney General Merrick Garland is facing it too. And President Joe Biden seemingly isn’t far behind. Driven by the demands of hard-right members, Republicans in the House are threatening impeachment against Biden and his top Cabinet officials, creating a backbeat of chatter about “high crimes and misdemeanors” that is driving legislative action, spurring committee investigations, raking in fundraising money and complicating the plans of Speaker Kevin McCarthy and his leadership team. Long viewed as an option of last resort, to be triggered only for the most severe wrongdoing, the constitutionally authorized power of impeachment is rapidly moving from the extraordinary to the humdrum, driven in large part by Republicans and their grievances about how Democrats twice impeached President Donald Trump. Republicans remain so opposed to Trump’s impeachments, in fact, that they are pressing for votes to expunge the charges altogether — an attempt to clear his name that is without direct precedent in congressional history. “We’re seeing a generation of Republicans who are much more willing to test the boundaries of how much you can weaponize procedures,” said Julian Zelizer, a Princeton University historian and political scientist. McCarthy on Sunday made Garland the latest target of a potential impeachment investigation as Republicans examine how the Department of Justice handled the prosecution of Hunter Biden for federal tax offenses.