"I look at that as, in a certain respect, as being a good thing because it means our testing is much better," he said at the White House.
The US has 1.5 million coronavirus cases and nearly 92,000 deaths, according to Johns Hopkins University.
In second place is Russia, with nearly 300,000 confirmed cases.
What did Trump say?
On Monday, Mr Trump was hosting his first cabinet meeting since the US outbreak began.