Congressional leaders were briefed about a hack on the Democratic Party a year ago, according to a report from Reuters.

However, the members could not tell targets about the hacking because it would have revealed intelligence agencies were still monitoring the hacking as well as the sources and methods they were using to monitor the hacking.

Among members briefed were Republicans Senate Majority Leader Mitch McConnell, Sen. Richard Burr, who is chairman of the Senate Intelligence Committee, Rep. Devin Nunes, chairman of the House Intelligence Committee and Speaker Paul D. Ryan.

Democrats briefed included House Minority Leader Nancy Pelosi, Senate Minority Leader Harry Reid, Sen. Dianne Feinstein and Rep. Adam Schiff, the ranking Democrats on the Senate and House intelligence committees.

[DCCC Hacked in Series of Cyberattacks Against Democratic Groups]

Since the leak of emails from the Democratic National Committee, there have been four resignations, including Rep. Debbie Wasserman Schultz as chairwoman. Hackers also tried to breach other Democratic groups like the Democratic Congressional Campaign Committee and the Democratic Governors Association.