Knowing Congress would not pass appropriations before the fiscal year and with the start of the flu season, President Trump signed EO 13887 on Sept 24, 2019.
Modernizing Influenza Vaccines in the United States to Promote National Security and Public Health
https://www.federalregister.gov/documents/2019/09/24/2019-20804/modernizing-influenza-vaccines-in-the-united-states-to-promote-national-security-and-public-health