According to various sources Trump has been under surveilance since 2004.

WASHINGTON, D.C. – Infowars.com have obtained credible information from law enforcement sources regarding individual records of U.S. citizens under National Security Agency (NSA) electronic surveillance in the years 2004 through 2010 – a database that suggests both Donald J. Trump and Alex Jones were under illegal, unauthorized government monitoring during those years.
Michael Zullo, formerly the commander and chief investigator of the Cold Case Posse (CCP), a special investigative group created in 2006 in the office of Joseph M. Arpaio, formerly the sheriff in Maricopa County, an Arizona State Certified Law Enforcement Agency, headquartered in Phoenix, Arizona, provided sections of the database to Infowars.com.
The electronic surveillance database, provided to Zullo by a whistleblower in 2013, was apparently created by the NSA as part of the NSA’s illegal and unconstitutional Project Dragnet electronic surveillance of U.S. citizens, first revealed by news reports published in 2005, as further documented by the revelations of whistleblower Edward Snowden in 2013.
Sheriff Arpaio and Chief Investigator Zullo have identified dozens of entries at various addresses, including both Trump Tower in New York City and Mar-a-Lago in Palm Beach, Florida, under which Donald Trump was apparently under NSA electronic surveillance from 2004, during President George W. Bush’s term of office, through 2009, the first year of President Obama’s presidency.
Electronic surveillance of Donald Trump was listed in the database for the following companies, locations, and dates:
Trump International 1 Central Park, NYC, NY 2008
Trump World Tower 845 United Nations Plaza, NYC, NY No Date
Trump Tower SAL 108 Central Park, NYC, NY 2007
Trump Palace Co 200 E. 69th Street A, NYC, NY 2008
Trump Entertainment 725 Fifth Ave. FL, NYC, NY 2007
Trump Organization 725 Fifth Ave. BSM, NYC, NY 2009
Trump Palace 725 Fifth Ave., NYC, NY 2004
Mar-a-Lago Club 1100 S. Ocean BL, Palm Beach, FL 2006
Trump International 401 N. Wabash Ave., Chicago, IL 2008
Douglass Limousine 239 Nassau St., Princeton, NJ 2008
Trump International 3505 Summit BLV, West Palm Beach, FL 2004
Flights INC P.O. Box 196, Hamilton MA 2004
Trump International 1 Central Park, NYC, NY 2008
Trump Hotels Huron Ave., Atlantic City, NJ No Date
Trump National 339 Pine Rd, Briarcliff, NY No Date
Trump Plaza & C 2500 Pacific Ave, Atlantic City, NJ 2008
Trump Palace Co. 200 E. 69th St., NYC, NY 2008
Seven Springs 66 Oregon Rd, Mount Kisco, NY 2006-2008
While attempts have been made to deny such domestic surveillance, reports from the New York Times in 2014 showed the Central Intelligence Agency had done just that by spying on a senate panel investigating the agency’s use of “enhanced interrogation.”