"Honeycutt said the SLS program is making progress on the Exploration Upper Stage (EUS), a more powerful upper stage planned for future SLS missions after EM-1. The EUS has also become a political issue, as Congress provided additional funding and direction for EUS work not requested by the agency in its recent budget requests. Congress directed NASA to spend at least $85 million on EUS in the fiscal year 2016 omnibus spending bill, and have it ready in time for the second SLS mission, EM-2. NASA, however, did not request enough funding in its fiscal year 2017 budget request to support development of the EUS in time for EM-2, even as it directed agency engineers to stop work on human rating the interim upper stage that will be flown on EM-1."
Keith's note: NASA did not ask for the money to build EUS and they have stopped working on ICPS. Right now SLS has no upper stage. And yet they claim that they are going to meet their launch dates. Yea, this sort of stuff really happens in Washington.