"It should be mandatory that all of these Countries, at a minimum, simultaneously, sign onto the Abraham Accords," Trump posted on Monday.

Since the ceasefire started, US President Donald Trump has veered between assurances peace was almost at hand and threats of new assaults.

Trump urged leaders of several Arab and other Muslim countries to sign onto the Abraham Accords during a call.

US President says more Middle East nations should establish relations with Israel if a peace deal with Tehran is reached