The Pentagon is expanding its military presence in the Middle East and Europe in response to worsening hostilities between Israel and Iran, U.S. officials said Monday, sending refueling planes and an additional aircraft carrier among the resources dispatched.

Before Israel struck Iran’s nuclear program, tensions were showing in U.S. lawmakers’ attitudes toward Israel. Democrats were increasingly critical of Israel’s war conduct in Gaza, with only a single Democratic senator reliably taking Israel’s side in public discourse.

The United States advised Americans not to travel to Israel after another wave of Iranian missile attacks struck the country.