The judge in the Georgia election subversion case involving Trump denied separate trials for two defendants.
The trial will start on October 23, despite concerns about trying all 19 defendants together in 40 days.
Prosecutors estimate a four-month trial with 150+ witnesses.
The hearing was broadcast live, unlike other Trump cases.
Special prosecutor Nathan Wade argued that the indictment alleges a conspiracy against all defendants, irrespective of the number.
Some defendants want to speed up the process, separate from others, or move the case to federal court, all pleading not guilty.