A little less than a year before his murder in Istanbul, Washington Post journalist Jamal Khashoggi spoke to an investigator for the 9/11 families suing Saudi Arabia and sent a text message to senior officials for the kingdom that day. That is the blockbuster allegation that the families’ attorneys made in legal filings and in federal court on Wednesday, attempting to show a pattern of witness intimidation toward anyone too closely scrutinizing Saudi ties to the worst terrorist attack in U.S. history.