Numerous Mar-a-Lago staff members have been subpoenaed as part of an investigation into former President Donald Trump’s handling of classified documents, a source familiar with the situation confirmed to Fox News. The source did not know the exact number of staff members who were issued court orders. CNN reported that Trump’s communication aide Margo Martin appeared before a grand jury in Washington, D.C., on Thursday, though she declined to answer questions when approached by one of the media company’s reporters. Special counsel Jack Smith is handling investigations into Trump over the FBI’s discovery of classified documents at his Palm Beach,...