"Trump’s team again defined classical broadly as all premodernist architectural styles, with roots in Greco-Roman antiquity..."

"... though art deco, which is on the list, is not typically considered traditional. The order defines 'traditional architecture' as Gothic, Pueblo Revival, Spanish Colonial, and Mediterranean styles historically rooted in parts of the United States. 'Designs diverging from classical architecture must convey the dignity, enterprise, vigor, and stability of the American government and command public respect,' the White House said in a fact sheet for the order, which also requires that Trump is notified when a building design deviates from the preferred style...."

From "Trump orders classical and traditional architecture for federal buildings" (Yahoo, passing along something from WaPo).

Justin Shubow, "the head of the National Civic Art Society [who] helped draft the order," taking the position that this wasn't a political issue, reminded WaPo about the time Barack Obama "accept[ed] the Democratic presidential nomination in 2008 in front of classical Greek backdrop. 'Whoever was stage-managing understood that this is how Americans think of the presidency. They do associate it with classical architecture.'"

I'd say that shows that it is a political issue. Obama was being political. It was not that he shared the ordinary American's taste for traditional architecture, but that he was trying to influence Americans to see him as belonging within the tradition that he and his handlers presumed they believed in. He wasn't elected yet, but, as we all saw at the time, he was acting as if he was already ensconced in the trappings of power.