President Trump’s efforts to transform the federal judiciary will enter a new front in the second half of his first term, with the president having the chance to rebalance the nation’s more liberal-leaning courts.

There are 12 vacancies currently to be filled in the appellate courts, according to the Administrative Office of the U.S. Courts, and three future vacancies. Six of the open seats are in the 9th U.S. Circuit Court of Appeals, which is considered to be the most liberal.