Christie announced Saturday he had tested positive for the virus.
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Christie is among those to take part in Trump's debate preparations and now have tested positive for COVID-19.
As of now, five out of nine known participants have tested positive: President Donald Trump, campaign manager Bill Stepien, former senior adviser Kellyanne Conway, and counselor Hope Hicks.
RELATED: List of notable figures who've recently announced a COVID-19 diagnosis
Emanuel said he's sending "care and concern for those who have recently tested positive in the White House."
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He was seen voting early Thursday morning at the Loop Super Site.
U.S. Sen. Dick Durbin tweeted Saturday morning that he, too, had tested negative for COVID-19, saying he hoped "others testing positive get well soon and emerge from this experience with resolve to tell the truth about the danger we face."