Kushner, who has been working on the peace plan for some two years, is expected to unveil his proposals in June after the Muslim fasting month of Ramadan. He has not said whether it calls for a two-state solution, a goal of past peace efforts.
"What we want to do is put something out that we think is based on logic where unquestionably we can say that this will lead to the Palestinian people living a much better life", he added. "It's been very disheartening for us to see the Palestinian leadership has basically been attacking a plan (when) they don't know what it is", Kushner said.
Previous statements by Mr Kushner and Mr Greenblatt suggest that the peace proposal will have two main components - a political part that addresses core issues such as the status of Jerusalem, and an economic part that aims to help the Palestinians strengthen their economy.
Israel should wait to see Donald Trump's Middle East peace plan before proceeding with any plans to annex West Bank settlements, the USA president's senior adviser Jared Kushner said.
Saeb Erekat said on Saturday that the PLO bodies have summoned for open meetings over means to confront and fight back the "century deal".
Europa League spot is 'right place' for Man United - Solskjaer
United, on the other hand, do not have a director of football and have a very uncertain future heading into a Europa League-bound season.
"A deal may mean that a party agrees to sell its property as a result of bankruptcy, that is, it entails a winning party and a loser one, a term used in the real estate industry and television entertainment games", he added.
The challenge lies with connecting to Palestinian Authority leaders who cut off diplomatic ties after President Trump recognized Jerusalem as Israel's capital.
The long-awaited Middle East peace plan is taking shape.
Jared Kushner has revealed new contours of the upcoming USA peace plan for the Middle East, indicating that it will pull back from long-standing mentions of a two-state solution with the Palestinians and accept Jerusalem as Israel's capital.
Kushner said that Trump wants the group to "really try to solve this" in a lasting way.
Les adieux plein de rage de Patrick Sébastien : "Je vais me battre"
Il a fait comprendre qu'il subissait cette situation, mais a promis qu'il ferait tout pour revenir le plus vite possible. Samedi soir, l'animateur présentait le dernier numéro de son émission culte sur France 2.
"The answer I gave him was I think short term it's probably harder, because people will be more reactive and emotional", Kushner said.
Kushner confirmed that any final agreement would recognise Jerusalem as the capital of Israel, a declaration that Trump has already made unilaterally.
Palestinians are sceptical about any USA proposals after a series of pro-Israel moves by Mr Trump's administration and the tough line he has taken toward them, cutting off aid and ordering the closure of the PLO's office in Washington.
The effort by Kushner and Jason Greenblatt, special representative for worldwide negotiations, has been conducted without participation from the Palestinians. When you work for your father-in-law, you can't disappoint.
But Kushner, whose role in government alongside his wife Ivanka Trump has drawn heated criticism on ethical grounds, is at least assured of support in one key corner.
Officiel: Franck Ribéry quittera le Bayern Munich cet été
Ce sera un adieu difficile, mais nous ne devons pas oublier ce que nous avons accompli ensemble. " Franck et Arjen sont de grands footballeurs".