FISA Court Judge Rosemary M. Collyer ruled that President Barack Obama and his top officials approved illegal surveillance on 30,055 citizens. Furthermore, Judge Collyer disclosed that one of every 20 data searches by the NSA on other citizens were illegal.

This collection of illegal data was compiled during the 2016 Presidential Election Campaign.

FISA is an abbreviation for the U.S. Foreign Intelligence Surveillance Court. The NSA is an abbreviation for the National Security Agency. 

A time stamp of the court ruling is attached above. Judge Collyer's entire 99-page court ruling is in the first link below:

https://www.scribd.com/document/349261099/2016-Cert-FISC-Memo-Opin-Order-Apr-2017-4#download&from_embed

https://saraacarter.com/declassified-memos-show-fbi-illegally-shared-spy-data-on-americans-with-private-parties/

https://www.circa.com/story/2017/05/03/politics/president-obamas-team-sought-nsa-intel-on-thousands-of-americans-during-the-2016-election

https://www.circa.com/story/2017/05/23/politics/obama-intel-agency-secretly-conducted-illegal-searches-on-americans-for-years

A summary of Judge Collyer's order is posted here: 

Judge Rosemary M. Collyer of the U.S. Foreign Intelligence (FISA) Court is also the Senior Judge of the U.S. District Court for the District of Columbia. She is pictured below:

http://www.dcd.uscourts.gov/content/senior-judge-rosemary-m-collyer

Updated May 2nd, 2017

The Dept. of National Intelligence (DNI) issued a report dated May 2nd, 2017. It found that 30,355 Americans were under surveillance under Section 702 of the FISA Act. 

Judge Collyer ruled that 30,055 of them were illegal. 

https://www.dni.gov/files/icotr/ic_transparecy_report_cy2016_5_2_17.pdf