President Bush again called Democrats "irresponsible" on Saturday for pushing an expansion he opposes to a children's health insurance program. "Democrats in Congress have decided to pass a bill they know will be vetoed," Bush said of the measure that draws significant bipartisan support, repeating in his weekly radio address an accusation he made earlier in the week. "Members of Congress are risking health coverage for poor children purely to make a political point." At issue is the Children's Health Insurance Program, a state-federal program that subsidizes health coverage for low-income people, mostly children, in families that earn too much to qualify for Medicaid, but not enough to afford private coverage. It expires Sept. 30. Bush has promised a veto, saying the measure is too costly, unacceptably raises taxes, extends government-covered insurance to children in families who can afford private coverage, and smacks of a move toward completely federalized health care. He has asked Congress to pass a simple extension of the current program while debate continues, saying it's children who will suffer if they do not. "Our goal should be to move children who have no health insurance to private coverage - not to move children who already have private health insurance to government coverage," Bush said.