The judges tasked with ruling on Donald Trump’s immunity claims have warned both the former president and special counsel Jack Smith to be prepared to discuss “discrete issues” raised in past filings, court records show. The U.S. Court of Appeals D.C. Circuit Tuesday told lawyers on both teams they should be ready by Jan. 9 to present oral arguments on issues raised in amicus briefs, or information provided by supporting groups. While it remains unclear what those discrete issues may be, amicus briefs have come in from high-ranking Republicans, attorneys who served in Trump’s White House and e…