Power appears to be central to efforts by top Obama administration officials to identify individuals named in classified intelligence community reports related to Trump and his presidential transition team, according to multiple sources.
The names of Trump allies in the raw intelligence reports were leaked to the press in what many in Congress and the current administration claim is an attempt by Obama allies and former officials to damage the White House.
The House Intelligence Committee, which is spearheading the investigation into these efforts, has issued subpoenas for Power and other top Obama administration figures, including former national security adviser Susan Rice, as part of congressional efforts to determine the source of these leaks.
Power's role in this unmasking effort is believed to be particularly questionable given her position as the U.N. ambassador, a post that does not typically require such sensitive unmasking activities, according to former U.S. officials and other sources familiar with the matter.
"Unmasking is not a regular occurrence--absolutely not a weekly habit. It is rare, even at the National Security Council, and ought to be rarer still for a U.N. ambassador," according to one former senior U.S. official who spoke to the Washington Free Beacon.
"It might be defended when the communication in question relates directly to U.N. business, for example an important Security Council vote," explained the former official, who would only discuss the matter on background. "Sometimes it might be done out of other motives than national security, such as sheer curiosity or to defend a bureaucratic position. Or just plain politics."
The Intelligence Committee's focus of Power and other key Obama officials is a prime example of the Obama administration's efforts to spy on those close to Trump, according to sources familiar with the ongoing investigation.
"The subpoena for Power suggests just how pervasive the Obama administration's spying on Americans actually was," said one veteran GOP political operative who has been briefed on the matter by senior Congressional intelligence officials. "The U.N. ambassador has absolutely no business calling for the quantity and quality of the intelligence that Power seems to have been asking for."
The source questioned why Power would need to uncover such classified intelligence information in her role at the U.N.