The U.S. is warning that Israel will be dealing a strategic victory to Hamas if it carries through with plans for an all-out assault on Rafah.

The city is the last major militant stronghold in Gaza, but it’s also home to more than 1 million displaced Palestinians civilians who are sheltering there.

President Joe Biden with a fresh threat, saying he will pause more offensive military assistance if Israel goes through with an invasion, making its sharpest move yet to influence the decision making of its ally in the ongoing war.