The Democratic Party began the formal vote to nominate Vice President Kamala Harris for president on Thursday, kicking off a virtual roll call that will cement her status as the party’s standard-bearer heading into November.

The Democratic National Committee opened the vote to the delegates who will decide the party’s nominee at 9 a.m. Delegates are emailed a personalized and watermarked form, and they can either send the form back or have the DNC call them to cast their vote. Ballots are being sent on a rolling basis, and the process is expected to take several days, with the voting window closing at 6 p.m. on Aug. 5.