The D.C. Democratic Party was required to file to the D.C. Board of Elections by March 16, but submitted the registration paperwork for Sanders a day late.

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NBC4 News reported that a voter in D.C. filed a challenge against the Vermont senator's registration, which will be heard in April.

To fix the issue, the D.C. Council could have an emergency vote if necessary, D.C. Democratic Party Chairwoman Anita Bonds told NBC.

The Democratic primary is on June 14.