After four days of trading strikes, both sides appeared to pause their attacks Monday.
Vice President JD Vance has postponed his trip.
Iran's top diplomat said Tuesday that the deal ending the war with the United States would also require Israel to withdraw from Lebanon, but the US has not said whether Lebanon was part of the final agreement.
This will be the president's fifth time physically attending the conference, and comes amid heightened global turmoil.
Former President Barack Obama is sharing his thoughts on President Donald Trump's handling of Iran in an interview with ABC News' Robin Roberts.