"We will not participate in the forum in Bahrain, because the Palestinians will not participate. We would prefer to have a clear idea of the [US] proposed peace plan," Bassil tweeted late Tuesday.
The minister noted that there had been no previous consultations with Lebanon on this plan.
The United States plans to release the economic part of its Israeli-Palestinian peace plan at the "Peace to Prosperity" economic forum, which will take place in Bahrain from June 25-26.
In the meantime, Palestinian leader Mahmoud Abbas said that the Palestinians already reject the US proposals and dubbed it the "prosperity instead of peace" plan.