The Senate Judiciary Committee wants more information from Trump's son-in-law.
Researchers say 4,700 is likely "just a fragment" of a larger campaign.
A ruling is due by the end of June.
Fortunately, you can take action in the face of digital vandalism.
WHAT'S HAPPENING
Consolidation, network effects, behavioral science and widespread tracking make it nearly impossible.
Stormfront is up and running again with the help of several internet companies that previously denied services to hate sites.
The effort began after it was reported that Jared Kushner and other senior White House officials had used private email accounts.
Her comments came just hours before reports that at least six Trump officials had used private emails.
Other senior Trump aides had also used private email accounts, including Reince Priebus and Steve Bannon.