From the article: Judge Trevor McFadden, from the District Court, declared that the actions of Kim Sajet, the Director of the Smithsonian National Portrait Gallery, were ‘insulting, partisan and odious’,
I think they can reject anything with “good” reason but not for political bias. (the question becomes, what is “good reason”?)
Which means they can reject anything they want, until (perhaps) someone complains.
Who gets to decide who is sane enough to own firearms?
Any progressive can tell you who should be making the decisions - it's obvious, right?