Trump has become openly critical of Israel's operations in Lebanon, opening one of the biggest rifts between the two countries in decades.
The Iranian delegation, led by parliamentary Speaker Mohammad Baqer Qalibaf and Foreign Minister Abbas Araqchi, arrived on Friday.
China has positioned itself as a facilitator, aiming to create conditions for dialogue and provide a platform for negotiations.
Trump told European leaders that Putin suggested that sequence, according to a source in the European delegation.