While some Palestine defenders on Wednesday welcomed U.S. President Joe Biden's threat to withhold bombs and artillery shells from Israel if it launches a major invasion of Rafah, critics noted that an invasion is already underway and accused the American leader of walking back a previous "red line" warning against an Israeli assault on the southern Gaza city.

Biden said for the first time that he'll stop sending bombs, artillery shells, and other arms to Israel if Prime Minister Benjamin Netanyahu orders a major invasion of Rafah, where more than a million Palestinians forcibly displaced from other parts of the embattled Gaza Strip are sheltering alongside around 280,000 local residents.

Referring to Israel's use of U.S.-supplied 2,000-pound bombs—which can destroy an entire city block and have been used in some of the war's worst atrocities—Biden told CNN's Erin Burnett that "civilians have been killed in Gaza as a consequence of those bombs and other ways in which they go after population centers."

Even the U.S. military—which has killed more foreign civilians than any other armed force on the planet since the end of........

© Salon