Outgoing Trump administration takes 11th hour action against the Houthi Movement, threatening even more dire civilian conditions for civilians in Yemen. Antipathy toward Iran by the United States appears to be a major factor. The terrorism designation “makes it harder to deliver lifesaving assistance in a country already experiencing the worst humanitarian crisis in the world,” according to Gregory Meeks, Chairman of the House Foreign Affairs Committee.
https://www.nytimes.com/2021/01/11/us/politics/trump-pompeo-houthis-yemen.html