ANNAPOLIS, Md. (AP) — Maryland’s highest court has heard arguments in an appeal by the state’s Democratic Party to stop a November referendum on the state’s congressional redistricting map.

Lawyers contended Thursday an online process used to gather thousands of signatures violates a legal requirement that information must be submitted directly by the signer, instead of from a form online that is later mailed. They also say the signer is supposed to be observed writing the signature.