Editorial: Biden is moving to end Trump’s inhumane border policies. Can he avoid triggering a new migrant surge?

The Biden administration is engaged in a high-wire act at the U.S.-Mexico border, trying to dismantle what it rightly regards as former president Donald Trump’s inhumane immigration policies and simultaneously to avoid signaling to desperate migrants that the doors to the United States have swung open amid a pandemic. The stance is inherently contradictory — little wonder it began springing leaks days after the new president took office.