There has been a great deal of concern over whether the Affordable Care Act (ACA), commonly known as Obamacare, will be repealed after President-elect Donald Trump takes office with Republicans holding majorities in both the House and Senate.

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After Missouri Secretary of State Jason Kander tweeted about the devastating impact of repealing the ACA Monday, he received an outpouring of replies from people concerned about losing coverage.

He, then, re-tweeted responses to illustrate who has benefited from ACA and would be hurt by its repeal.

Some of the tweets were about people being concerned that pre-existing health conditions would prevent them or their loved ones from qualifying for — and affording — health insurance in the future.

Some Twitter users said the ACA granted them financial freedom and allowed them to pursue their chosen careers.

The Urban Institute, a nonpartisan Think Tank, published a study Wednesday analyzing how many people would lose healthcare access if the ACA was repealed and a replacement measure stalled in Congress.

From ABC News:

"The study found that 22.5 million people would lose coverage directly due to repeal of the law's subsidies, Medicaid expansion, and its individual requirement to carry health insurance.

"Another 7.3 million would become uninsured because of the ripple effects of market upheavals. That could happen if insurers lose confidence in the Republican promise of a replacement and abandon the individual market. A key industry worry is that a repeal law would get rid of subsidies and mandates but still leave insurers on the hook for covering people with health problems.

"The number of uninsured people would rise to nearly 59 million in 2019, and the nation would have a higher uninsured rate than when the ACA passed in 2010, the study found.”

A separate study, published Monday by the Kaiser Family Foundation, estimates that about 27 percent of Americans under 65 have pre-existing conditions that could prevent them from accessing health insurance if Obamacare is repealed.

Senate Majority Leader Mitch McConnell (R-Ky.) doubled down on plans to repeal and (eventually) replace the ACA in a Monday press conference.

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“We’ll move first with the Obamacare replacement resolution and then we will come with what the replacement actually will be," McConnell said.