MSNBC's Alicia Menendez fills in for Ari Melber to host "The Beat" on Thursday, December 23, and reports on the coronavirus, Trump's latest effort to prevent the Jan. 6 Committee from accessing secret White House documents, the verdict in the Kim Potter trial, and the right-wing push to ban "offensive" books from Texas public libraries. Watergate prosecutor Jill Wine-Banks and Fernand Amandi join.