Alex Isenstadt and John Bresnahan report:
The House GOP campaign arm suffered a major hack during the 2018 election, exposing thousands of sensitive emails to an outside intruder, according to three senior party officials.
The email accounts of four senior aides at the National Republican Congressional Committee were surveilled for several months, the party officials said. The intrusion was detected in April by an NRCC vendor, who alerted the committee and its cybersecurity contractor.
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