A few months ago, President Biden seemed so fed up as Prime Minister Benjamin Netanyahu of Israel ignored his calls for restraint in Gaza that he finally sounded tough.

In March, Biden was asked if his calls for Israel not to invade the southern Gaza city of Rafah marked a “red line,” meaning that an invasion would lead to serious consequences.

“It is a red line,” Biden said, “but I’m never gonna leave Israel.”

What that added up to wasn’t clear, perhaps not even to Biden. But as someone who generally admires Biden’s foreign policy, I wanted to think that the president meant that an Israeli invasion of Rafah would lead to a suspension of transfers of offensive weapons, but no interruption of defensive weapons such as protections against incoming missiles.

Then in April, Biden called Netanyahu and seemed again to draw a line that was at least pink. He urged an immediate cease-fire and, according to the White House announcement, “made clear the need for Israel to announce and implement a series of specific, concrete, and measurable steps to address civilian harm, humanitarian suffering, and the safety of aid workers.”

The statement continued, “U.S. policy with respect to Gaza will be determined by our assessment of Israel’s immediate action on these steps.”

In May, Biden once more seemed to establish a red line. “If they go into Rafah, I’m not supplying the weapons” used against cities, he told CNN.