He said he has mild symptoms and will be quarantining for five days.
As the COVID-19 pandemic has swept the globe, more than 5.4 million people have died from the disease worldwide, including over 825,000 Americans, according to real-time data compiled by Johns Hopkins University's Center for Systems Science and Engineering.
About 62% of the population in the United States is fully vaccinated against COVID-19, according to data from the Centers for Disease Control and Prevention.
The U.S. Food and Drug Administration revealed new data on the efficacy of antigen tests for detecting the omicron COVID-19 variant.
The data so far suggests the tests do detect the variant, but they may have reduced sensitivity, the agency said.
The FDA and National Institutes of Health will continue to review the antigen tests' performance on the variant.
UCLA said its football team has pulled out of Tuesday night's San Diego County Credit Union Holiday Bowl due to COVID-19.
UCLA was set to play North Carolina State.
-ABC News' Matt Fuhrman
Greece reported 21,657 new COVID-19 cases on Tuesday -- a record 133% increase from the 9,284 new cases reported on Monday, according to government data.
Eighty-five percent of COVID-19 patients in Greece's hospitals are not vaccinated.
-ABC News' Christine Theodorou
Forecast models used by the CDC suggest cases, hospitalizations and deaths will rise over the next four weeks.
According to the models, the U.S. death toll could reach 862,900 by Jan. 22.
Nationally, estimates suggest between 8,700 and 20,800 Americans could be admitted to the hospital each day by Jan. 10.
These forecasts are from the COVID-19 Forecast Hub at UMass Amherst, where a team monitors and combines forecasting models from the nation’s top researchers. The team then creates an ensemble -- displayed like a hurricane forecast spaghetti plot -- usually with a wide cone of uncertainty.
-ABC News' Arielle Mitropoulos, Brian Hartman
