US House of Representatives Speaker Nancy Pelosi says Israel's proximity to Iran is a threat to all of us and the responsibility of all of us.

Pelosi, along with a delegation of Democratic members of Congress arrived in the country on Tuesday as part of her first official visit to Israel in over two years and discussed Iran nuclear talks taking place in Vienna with Knesset members on Wednesday.

"It's a threat to the world. Israel's proximity to Iran is a threat to all of us and the responsibility of all of us", she stressed.

Pelosi -- who once lauded the 2015 nuclear deal as a diplomatic masterpiece – said, "We are together in the fight against terror posed by Iran and its nuclear development”.

Pelosi said relations between the Knesset and Congress were critical, and signed the guestbook of the Knesset's Chagall Hall, writing that the security ties between Israel and the US are stable and strong, and that “our friendship is eternal.”

Knesset Speaker Mickey Levy, who greeted Pelosi, thanked her in particular for congressional approval of funding for the Iron Dome missile defense system, saying, “The passage of the law to fund the replenishment of the Iron Dome system will forever be associated with you... The State of Israel could not have asked for a better friend."

Pelosi said the formation of the State of Israel is the greatest accomplishment of the 20th century, noting that the US is proud to have Israel as an ally and will continue supporting its security and stability.