This renowned German professor was headed to UVA to teach about the rise of far-right extremism. The State Department held up his visa.

Washington Post

When German academic Hajo Funke received word he was selected to be a visiting professor at UVA, he hastily began preparing. When the consulate returned his passport, it was accompanied not by a visa, but by a letter that said a decision about his visa had been delayed for three to six months, jeopardizing the two classes he was set to teach.

https://www.washingtonpost.com/local/education/this-renowned-german-professor-was-headed-to-u-va-to-teach-about-the-rise-of-far-right-extremism-the-state-department-held-up-his-visa/2020/02/20/adef251e-5425-11ea-9e47-59804be1dcfb_story.html