WASHINGTON — Expanded unemployment benefits that have kept millions of Americans afloat during the pandemic expired on Monday, setting up an abrupt cutoff of assistance to 7.5 million people as the Delta variant rattles the pandemic recovery.The end of the aid came without objection from President Biden and his top economic advisers, who have become caught in a political fight over the benefits and are now banking on other federal help and an autumn pickup in hiring to keep vulnerable families from foreclosure and food lines.The $1.9 trillion economic aid package Mr. Biden signed in March included extended and expanded benefits …
