WASHINGTON (AP) — Republican John McCain warned Monday that a nuclear-armed Iran would threaten Israel and cautioned that withdrawing troops from Iraq would weaken the entire Middle East as he courted Jewish voters wary of Democrat Barack Obama.

"The threats to Israel's security are large and growing, and America's commitment must grow as well," the likely Republican presidential nominee said in a speech, expressing strong support for a U.S. ally and raised doubts about Obama.