Israel’s top national security adviser predicted that the U.S. would get involved in Israel’s war on Hamas if the conflict escalated to include other regional powers like Hezbollah or Iran.

The official, Tzachi Hanegbi, cited the U.S. movement of two air craft carrier strike groups into the Eastern Mediterranean as a key indicator. Meanwhile, U.S. Defense Secretary Lloyd Austin has emphasized that there are no U.S. boots on the ground and no plans to deploy them.

“[Biden] is making clear to our enemies that if they even imagine taking part in the offensive against the citizens of Israel, there will be American involvement here,” Hanegbi said.

President Biden has nevertheless warned Hezbollah and Iran to stay out of the conflict, but he has not made specific threats of what the U.S. will do if they do join the war.

Austin placed approximately 2,000 personnel and a range of units on a heightened state of readiness through a prepare to deploy order on Tuesday. The move increases the DOD’s ability to respond quickly to fast-moving events in and around Israel.