Donald Trump expressed certainty his big gamble to directly assist the Israelis delivered a knockout blow to Iran’s nuclear program — even as many supporters and detractors alike were warning that U.S. military action could draw the United States into an expansive regional conflict.

Trump, in brief remarks to the nation on Saturday evening from the White House, said the U.S. strikes “obliterated” three critical Iranian enrichment facilities and “the bully of the Middle East must now make peace.”

But it’s a risky moment for Trump, who has belittled his predecessors for tying up America in “stupid wars” and has repeatedly said he was determined to keep the U.S. and the Middle East from another expansive conflict.