“They will never see that money unless they adhere to that agreement,” Mr Trump said Friday.
“Occasional statements of belligerent threats to have Ethiopia succumb to unfair terms still abound,” Ethiopia’s statement said Saturday. “These threats and affronts to Ethiopian sovereignty are misguided, unproductive, and clear violations of international law.”
It added: “Ethiopia will not cave in to aggressions of any kind.”
There was no comment from the Egyptian government on Mr Trump’s remarks, but pro-government media covered them extensively.
Egypt has repeatedly said it wants to settle the dispute through diplomatic means, but it has said it would use “all available means” to defend the interests of its people.
Ethiopia celebrated the first filling of the dam in August, citing heavy rains, to the dismay of Egypt. Ethiopia later banned flights over the dam amid concerns over possible military action by Egypt.
Now, with Mr Trump’s new remarks, some Ethiopians are urging Ethiopian Americans to help vote him out of office in next month’s election.