President Trump said Friday that members of Congress, including Democrats, have new motivation to reform healthcare policy following his Thursday decision to stop paying insurers certain subsidies under Obamacare.

"ObamaCare is a broken mess. Piece by piece we will now begin the process of giving America the great HealthCare it deserves!" Trump tweeted Friday morning.

He added that Democrats should see that Obamacare is "imploding," and said, "Dems should call me to fix!"

The White House announced late Thursday that the decision to stop paying cost-sharing subsidies to insurance companies was based on guidance from the Justice Department and Department of Health and Human Services. Both departments concluded there is no appropriation from Congress for the payments.

Trump had been approving the $7 billion in payments on a monthly basis. But Republicans had argued that a federal court had found there was no legal basis for making them.

Trump had been considering abandoning the payments, and had until Oct. 30 to provide an update on their fate.

Democrats balked at the Trump administration's announcement and called the move an attempt to "sabotage" Obamacare.

"It is a spiteful act of vast, pointless sabotage leveled at working families and the middle class in every corner of America," Senate Minority Leader Chuck Schumer and House MInority Leader Nancy Pelosi said in a joint statement. "Make no mistake about it, Trump will try to blame the Affordable Care Act, but this will fall on his back and he will pay the price for it."

House Speaker Paul Ryan applauded Trump.

"Today's decision by the Trump administration to end the appeal of that ruling preserves a monumental affirmation of Congress's authority and the separation of powers," Ryan said late Thursday. "Obamacare has proven itself to be a fatally flawed law, and the House will continue to work with Trump administration to provide the American people a better system."