Grassley and Johnson's request did not set date ranges for the responsive documents, but State Dept officials decided to cut them off at Dec 2017—a limit that would ensure any potentially damaging evidence of Trump's own actions in Ukraine were excluded. https://www.politico.com/news/2020/08/18/pompeo-aide-biden-russia-documents-397895

The senators' request didn't include a deadline for the State Dept to respond, an ordinary feature of oversight requests. But State tasked its top officials to respond by Aug. 28, a deadline that comports with Johnson's efforts to release a final report in September.

Democratic aides said the State Department's marshaling of resources to aid Johnson and Grassley in response to a voluntary request stands in stark contrast to the department's refusal to share any documents with the House, even in response to subpoenas. https://www.politico.com/news/2020/08/18/pompeo-aide-biden-russia-documents-397895