CNN: “For more than three years, federal prosecutors investigated whether money flowing through an Egyptian state-owned bank could have backed millions of dollars Donald Trump donated to his own campaign days before he won the 2016 election, multiple sources familiar with the investigation told CNN. The investigation, which both predated and outlasted special counsel Robert Mueller’s probe, examined whether there was an illegal foreign campaign contribution. It represents one of the most prolonged efforts by federal investigators to understand the President’s foreign financial ties, and became a significant but hidden part of the special counsel’s pursuits.”

“The investigation was kept so secret that at one point investigators locked down an entire floor of a federal courthouse in Washington, DC, so Mueller’s team could fight for the Egyptian bank’s records in closed-door court proceedings following a grand jury subpoena. The probe, which closed this summer with no charges filed, has never before been described publicly. Prosecutors suspected there could be a link between the Egyptian bank and Trump’s campaign contribution, according to several of the sources, but they could never prove a connection. It’s not clear that investigators ever had concrete evidence of a relevant bank transfer from the Egyptian bank. But multiple sources said there was sufficient information to justify the subpoena and keep the criminal campaign finance investigation open after the Mueller probe ended.”