"You know, when companies who have made a commitment and have legacy costs and all of a sudden want to walk away from that commitment and lay it on the federal government, that's a problem. It's a fiscal problem for us"

This quote by Dennis Hastert is describing business who have made a commitment to their employees, such as supplying benefits and pensions, but then try to revoke that commitment and expect the federal government to choose up the tab. Hastert is saying that this is a problem, both for the business and for the federal government. It is a fiscal problem since the government needs to spend for the expenses that the companies are attempting to avoid. This can put a stress on the federal government's budget and can result in higher taxes or cuts in other locations. Hastert is saying that business need to be held responsible for their dedications and not anticipate the government to bail them out.