The Democratic National Committee is raising the bar for candidates to qualify for the fifth candidate debate, to be held in November. These criteria only apply to this one debate.
Polling: 3% in four different qualifying polls (can be a combination of national polls or those from among the four early states) OR 5% in two polls from among the four early states. The 5% option is new; the threshold in the the four-poll rule is increasing from the 2% in place for the September and October debates.
The early states are Iowa, New Hampshire, South Carolina and Nevada, which are all scheduled to hold their primary or caucus in February, 2020. Polls must be released from September 13 through seven calendar days prior to the November debate (date is TBA). For more detailed rules on what polls qualify, see the DNC press release.