Top Republican and Democratic congressional leaders affirmed U.S. solidarity with Israel on Tuesday amid growing concerns over Iran’s nuclear program.

Following a meeting of key House leaders and Israeli Prime Minister Benjamin Netanyahu at the U.S. Capitol, House Speaker John Boehner (R-Ohio) said “the United States Congress will never allow Israel to stand alone.”

Boehner added that the “growing threat of a nuclear Iran cannot be ignored,” and that the U.S. and Israel must be clear with each other, and to the Iranians.