Van Hollen, a supporter of the law, said it was important for the reforms to go into effect and that any kinks could be ironed out further down the road.
“We need to make sure that that process works, that system works. We can look at ways to modify it down the road, possibly, but let's get that in place.”
Republicans have been pushing for a delay of the mandate requiring Americans to have health insurance, with some threatening to shut down the government by refusing to back a continuing resolution next month that would fund the healthcare law.
Van Hollen said such a move would be incredibly dangerous and a “huge mistake.”