The Democratic National Committee has voted to move forward with its plan to hold a virtual roll call ahead of its August convention in Chicago, with its newly adopted plan only giving candidates a small window of opportunity to challenge Vice President Kamala Harris.

The Democratic National Convention‘s rules committee met Wednesday afternoon to adopt a framework to select the party’s presidential nominee after President Joe Biden suspended his campaign Sunday.

The newly adopted plan only gives candidates from Thursday to 6 p.m. Saturday to declare their candidacy and gain 300 delegates with no more than 50 from one state to make their case for the virtual roll call by Tuesday.

The short deadline all but guarantees Vice President Kamala Harris will clinch the nomination, as she already has secured pledged support from more than the 1,976 delegates needed and does not have any public challengers. Voting on the nomination will likely begin on Aug. 1, however, if there are at least two candidates who qualify, voting will likely begin on Aug. 3.