US-Israel relations have reached a critical crossroads that shows that even President Joe Biden’s staunch support can reach its limits when it starts to conflict with wider American national security and moral interests — and his own dicey political position. Biden’s warning in a CNN interview that he’d halt some weapons shipments to Israel if it invades the Gazan city of Rafah marks the most direct US attempt to rein in its ally in a national security crisis since the Reagan administration...