It has been widely reported that President Trump is filling federal judicial vacancies at a much faster pace than his predecessors. But the political impact of that pace is blunted by several factors, including the fact that most existing vacancies were created by the retirement of a previous Republican appointee, and the fact that many circuit courts continue to be dominated by Democratic appointees.
Russell Wheeler of the Brookings Institution provides an outstanding analysis of the impact of the President’s judicial appointments here. It is highly recommended reading, as is everything Russell writes on this and related issues.