It's the last day to sign up for health insurance under the Affordable Care Act.
And at Whitman-Walker Health, a community health center near downtown Washington D.C., people have been streaming in looking for help choosing an insurance plan.
Katie Nicol is a senior manager who oversees the five so-called navigators whose sole job is to help people sign up for insurance coverage.
"We've been busy, you know, consumer after consumer all day," she said in an interview Monday. She expects to be busier Tuesday.
Which may be surprising, given all the uncertainty surrounding the Affordable Care Act.
Not far from Whitman-Walker, Republicans in Congress and President Donald Trump are working to dismantle the health care law.
Members of the House and Senate earlier this month took the first steps to repeal the ACA. Trump followed suit, issuing an executive order that asked his agency heads to do all they could to ease what he called the law's "burdens" on companies, insurers and individuals.
So this could be the last enrollment day ever for Obamacare, which first provided coverage in 2014.
Even so, as the midnight deadline to sign up for coverage approaches, Nicol says demand for insurance hasn't waned.
"Our volume has been the same as it has been in past years," she said.
That tracks with the latest numbers released by the Department of Health and Human Services. As of January 14, 8.8 million people had signed up for coverage — slightly more than last year.
Those numbers haven't been updated since Trump moved in to the White House on January 20, so it's unclear whether enrollments have picked up or slowed.
At Whitman-Walker, Nicol says, her clients are worried about what's next.
"We definitely have a lot of people coming in with a lot of anxiety surrounding the ACA and whether it's still gong to be here just through the end of the year," she said.
She says they are reassuring people that insurance is available now and likely will continue to be available through the year. As for next year, who knows.
That's because Republicans have spent the last few months talking about repealing and replacing Obamacare, but details of a new plan have been sparse.
The concern about the future that Nicol sees in D.C. is showing up across the country, says Jennifer Sullivan, vice president for programs at Enroll America, which works to get people affordable health insurance.
"Between action in Congress and actions from the new administration, consumers are confused," she says. "We are hearing that consumers are concerned and need clarification of what's available."
That's likely at the top of the mind of many Republicans who are grappling with how to replace the ACA with a program that will insure at least as many people as the ACA.