Their agenda is to grind the government to a halt and destroy public faith in the institution. That's been their agenda all along. They campaigned on the premise that our government is broken, and they've been actively trying to break it since they were elected. This has been the core Republican strategy since the 1950s.
Once they think they can get away with it, they'll sell off the government's functions to private interests because they feel that government should only exist to maintain an army and police force to enforce their property rights.