Two series of internal emails in July between officials at the Centers for Medicare and Medicaid Services (CMS), including HealthCare.gov project manager Henry Chao, describe struggles with contractors, staff shortages and software problems long before the federal healthcare website crashed on its October 1 launch and threw the rollout of Obamacare into political turmoil.

In a July 16 email sent ahead of a meeting with then-prime contractor CGI Federal, Chao describes the agency’s low confidence level in the project work, from constant struggles with releases to changing delivery dates and poor quality assurance on software.

“I just need to feel more confident they are not going to crash the plane at take-off,” Chao says in the email, which was among several documents the Republican investigators released.