"We condemn US threatening Iran with war and destruction and its attempt to deploy troops in the Middle East. Imperialism always seeks to keep the military industry at work," Morales wrote on Twitter.
The remark follows US President Donald Trump's warning made late last week to Iran that a fight against the United States would be its "official end."
Since his election in 2016, Trump has antagonised the 2015 international nuclear agreement on Iran and unilaterally withdrew his country from the deal in 2018.
Washington, in turn, continued to impose several rounds of economic sanctions against Tehran and increased its military buildup in the Middle East, deploying Patriot missile defence system and other military hardware on the ground and sending at least seven warships to the Persian Gulf.