POTUS promises consequences for Iran after reports that the Islamic Republic could use its own inspectors at nuclear sites.

The United States will respond firmly if Iran fails to honor the accord aimed at curbing its nuclear program, President Barack Obama said Friday, as he works to win over undecided US lawmakers.

"We have a wide array of unilateral and multilateral responses that we can employ if Iran fails to meets its commitments," Obama said in a letter dated August 19 and sent to Jerrold Nadler, a Democrat in the House of Representatives who announced that he will vote to approve the accord.

In his letter released by the White House, Obama reiterated his view that the accord reached last month in Vienna is good for the United States, Israel and the Middle East in general.

The president also insisted, as he has many times, that all options remain on the table if Iran does not abide by the accord - a concern which heightened after it was revealed that Iran could be responsible for its own inspections.

The agreement lifts economic sanctions against Tehran in exchange for restrictions and other measures designed to prevent it from developing nuclear weapons.

"All of the options available to the United States - including the military option - will remain available through the life of the deal and

beyond," Obama said.

The letter was released as opponents of the accord wage a fierce campaign against it ahead of a vote in Congress in September.

Opponents say the accord goes too easy on Iran, by not allowing spot inspections of nuclear sites or forcing it to halt support of terrorist groups, for instance.

So far only two Democratic senators - Chuck Schumer and Robert Menendez - have come out publicly against the accord.

It is unlikely that opponents can muster the two-thirds majority they would to override a certain Obama veto if an initial vote by lawmakers rejects the accord.

Nadler said Friday he supports it.

It is not perfect, but it "gives us the best chance of stopping Iran from developing a nuclear weapon," he said in a statement.

Nadler said he had reached this conclusions from his perspective as "an American Jew who is both a Democrat and a strong supporter of Israel."

The accord, vehemently opposed by Israeli Prime Minister Binyamin Netanyahu, has sharply divided the US Jewish community.

AFP contributed to this report.

(Arutz Sheva’s North American desk is keeping you updated until the start of Shabbat in New York. The time posted automatically on all Arutz Sheva articles, however, is Israeli time.)