There’s an argument to be made that president Joe Biden’s steadfast backing of Israel’s military campaign in Gaza — which so far has killed 20,000 Palestinians and is set to turn the enclave into a hub of starvation and disease — are unavoidably driven by the stifling political realities that exist in the United States when it comes to Israel.

That argument is becoming harder and harder to make.

Earlier this week, a coalition of six national security Democrats authored a letter to Biden sounding the kinds of warnings that longtime left-wing critics of both Israel’s current war and its treatment of the Palestinians have issued, urging the president to “use all our leverage to achieve an immediate and significant shift of military strategy and tactics in Gaza.”