"Identities of Americans who show up in U.S. surveillance against foreign targets are generally concealed, but can be unmasked by intelligence agencies in certain circumstances. Those include situations when the communications contain information that a crime has or is about to be committed, when the Americans’ identity is necessary to understand the importance of the foreign intelligence collected or when the communication provides information that an American may be an agent of a foreign power.

Asked whether Trump’s communications may have been swept up in surveillance, Nunes said it was “very possible.”