Trump signed an executive order that day giving federal agencies broad powers to unwind regulations created under the ACA, which is also widely known as Obamacare.

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“Your administration must commit to putting an end to all efforts to unravel the ACA, undermine the health care system, increase costs, or hurt patients, providers and families,” the letter tells Trump.

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The letter comes after the House Republican effort to pass a bill to repeal and replace the ACA collapsed last Friday. Since that time, Trump and his aides have expressed openness to working with Democrats on health-care and other big legislative priorities.

But the president also blamed the failure of the House bill in part on Democratic intransigence. Not a single Democrat supported it. Many Republicans also opposed it.

“ObamaCare will explode and we will all get together and piece together a great healthcare plan for THE PEOPLE. Do not worry!” Trump tweeted Saturday. The Senate Democrats took issue with that statement.

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“While we would welcome your sincere interest in bipartisan work to improve quality, lower costs, and expand coverage, we are concerned by your recent statement indicating it would be a good thing to make the ACA ‘explode,'” they write, adding, “Instead, we urge you to use your executive authority to support a stable, competitive insurance marketplace.”

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Republicans hold a 52-48 advantage over the Democratic caucus in the Senate. Most divisive pieces of legislation require 60 votes to pass, due to Senate rules protecting the minority party. The letter serves as notice that Democrats have the numbers to block Senate Republicans from taking steps under normal Senate procedure to go after the ACA.