Over the weekend, President Trump twice tweeted out threats to attack sites that are important to "Iranian culture." Since then, Trump appeared to walk back his comments somewhat, and Secretary of Defense Mark Esper has suggested that the US would make no such attacks, stating that the country would follow "the laws of armed conflict."

source https://www.cnn.com/2020/01/07/opinions/iran-cultural-heritage-sites-trump-golestaneh/index.html