As one of President Trump’s most dedicated supporters on the international stage, Israel’s Prime Minister Benjamin Netanyahu is suddenly faced with a vital and unexpected question, reports the Associated Press:

In light of his abandonment of the Kurds in Syria, can Trump be trusted?

“The Israelis had thought of Trump as a special U.S. leader very much in tune with their view of the region,” Dan Shapiro, who was Barack Obama’s ambassador to Israel, told the AP.

Now they’re coming to terms with the cold hard reality that his isolationist instincts and his chaotic, impulsive decision making can actually be very damaging to their interests.

In particular, the AP says, “there are growing fears that Israel’s archenemy Iran could be emboldened by what appears to be an increasingly hands-off American policy in the region.”

For Netanyahu, the worry is “that Trump’s actions, or lack thereof, could encourage Iran to step up what Israel sees as aggressive and hostile activity” in Syria, Iraq and Lebanon.

Eytan Gilboa, an expert on U.S.-Israel relations at Israel’s Bar-Ilan University, summed it up this way:

The main image is [of] a very weak U.S. that does not help its allies. It deserts its allies.”