SpaceX said it has pitched NASA a “simplified mission” to put astronauts back on the moon following criticisms over delays by Sean Duffy, the space agency’s acting administrator.

In a company blog post out Thursday, Elon Musk’s aerospace and defense contractor said: “We’ve shared and are formally assessing a simplified mission architecture and concept of operations that we believe will result in a faster return to the Moon while simultaneously improving crew safety.”

Earlier this month, Duffy said in an interview on CNBC’s Squawk Box, that SpaceX was behind schedule on building its lunar landing system for NASA’s Artemis III mission and that the agency would reopen the landing contract for that mission to competitors such as Jeff Bezos’ rocket maker Blue Origin.

A NASA spokesperson in an email to CNBC said that the agency “has received and is evaluating plans from both SpaceX and Blue Origin for acceleration of HLS production.”

“Following the shutdown, the agency will issue an RFI to the broader aerospace industry for their proposals,” the spokesperson said. “A committee of NASA subject matter experts is being assembled to evaluate each proposal and determine the best path forward to win the second space race given the urgency of adversarial threats to peace and transparency on the Moon.”