Rose Garden celebration notwithstanding, the battle is far from over on the passage — or lack of it — of the American Health Care Act.

Thanks to the chasm that's opened up between the most conservative Republicans and the more moderate of their colleagues within the party, the major fight brewing could actually be within the party itself, rather than between Republicans and Democrats.

The bill passed last week by the House may be on its way to the Senate, but that doesn't mean that it will be voted on there — in fact, Republican Senators have announced their intent to write their own health care bill that will likely differ significantly from the one that passed via substantial arm-twisting by the president and Republican leaders.