Washington (CNN) The nation's top infectious disease expert said Sunday that based on models, the United States could eventually see 100,000 or more deaths from the novel coronavirus, which has already claimed more than 2,000 American lives as cases surge across the US.

"Whenever the models come in, they give a worst-case scenario and a best-case scenario. Generally, the reality is somewhere in the middle. I've never seen a model of the diseases that I've dealt with where the worst case actually came out. They always overshoot," Dr. Anthony Fauci, a key member of the White House's coronavirus task force, told CNN's Jake Tapper on "State of the Union."

"I mean, looking at what we're seeing now, you know, I would say between 100 and 200,000 (deaths). But I don't want to be held to that," he said, adding that the US is going to have "millions of cases."

The comments come as the number of reported coronavirus deaths doubled to more than 2,000 nationwide in two days. The US has the most confirmed cases worldwide, with more than 121,000 as of Saturday morning.

During a Sunday evening news conference, President Donald Trump said that, based on models that the coronavirus outbreak could bring 100,000-200,000 deaths in the US, his administration would "have done a good job."