The Washington Post's editorial board ripped into President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE on Thursday, blaming him for 3 million more people losing health insurance during his time in office.

The Post points to the "hostile steps" taken by the administration and Republicans to dismantle ObamaCare, including the president's "negative rhetoric and rules changes," that could have prevented Americans from enrolling, the shortening of the ObamaCare enrollment period and the repeal of the individual mandate.

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"Obamacare was never perfect, but it was steadily bringing down the share of Americans without health insurance. Why would anyone want to reverse that achievement?" the board asked.

Repealing and replacing ObamaCare was one of Trump's biggest campaign promises in 2016.

Senate Republicans, however, failed last year to fulfill their seven-year campaign promise of repealing and replacing the Affordable Care Act.

They claimed a significant victory in December when they passed a tax-reform bill that repealed the law's individual mandate.

The Congressional Budget Office estimated that the mandate's repeal would lead to a 10 percent increase in premiums and leave 4 million more people without insurance by 2019.

More than 8 million people signed up for ObamaCare through the federal exchanges at the end of last year.