The executive order is viewed as Trump's most concrete action to undo the ACA, a signature domestic policy by former President Barack Obama, after Senate Republicans had repeatedly failed to pass legislation to dismantle the 2010 law, a promise Trump has made to his voters.

Trump said congressional Democrats broke the U.S. healthcare system seven years ago "by forcing the Obamacare nightmare onto the American people," saying that "the cost of Obamacare has been so outrageous it is absolutely destroying everything in its wake."

Those proposals, Trump noted, "should have been done a long time ago, and it could have been done a long time ago," but White House officials said the changes could take at least six months to take effect.

Republican Senator Rand Paul of Kentucky, who stood behind Trump at the signing ceremony, backed the president's move, saying that it would "reduce government interference and provide more affordable health care options to everyday Americans."

Democrats, who have consistently opposed the GOP's efforts to repeal and replace Obamacare, voiced their opposition against the executive order.

Senate Minority Leader Chuck Schumer of New York tweeted that Trump is "using a wrecking ball to singlehandedly rip apart and sabotage" the country's health care system after attempts to repeal the ACA failed in Congress.

"The American people overwhelmingly rejected Trumpcare, but President Trump is still spitefully trying to sabotage their health care," House Democratic Leader Nancy Pelosi said in a statement.

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