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In page White House Visitors Office:

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The process used to screen potential visitors for tours has come under fire due to concerns of identity theft that can affect potential visitors.[4] Concerns include that those who apply to be visitors must provide their personal information to congressional offices, who request this information via e-mail, and in turn, send the information via e-mail to the White House. The e-mail format that is used in this process is susceptible to interception.