Donald Trump has nominated John Ring to fill the vacancy left by Phil Miscimarra whose term ended in December. Ring is a business-side labor relations attorney who works for the firm Morgan Lewis and Bockius, which has advised the Trump Organization on taxes since 2005. If confirmed by the Senate, his appointment will ensure a Republican majority on the board, and his term would be for five years.
See "Trump names lawyer at firm advising him as pick for labor board", Reuters Staff, Reuters, January 17, 2018