from a blog page 48 American Politicians with ties to Ukraine posted Oct 12, 2019. The details for all are general and basic.
Republican U.S. Senator from Utah, and 2012 Republican presidential nominee. Hired former C.I.A. officer Cofer Black (who joined Burisma in 2017) as his campaign manager. One of Romney's sons has been accused of being on the board of a Ukrainian energy company (although which one of his five sons is not clear; perhaps Tagg because he is the only Romney son with political work in his resume and he served as a surrogate for his father during his presidential campaign).
http://www.npr.org/2019/10/04/766579412/what-to-know-about-the-ukrainian-company-at-the-heart-of-trumps-biden-allegation
http://www.snopes.com/fact-check/sons-top-democrats-ukraine-clinton/