Secretary of State Hillary ClintonHillary Diane Rodham ClintonO’Malley tells Dems not to fear Trump FBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Pelosi blasts California Republicans for supporting tax bill MORE was hospitalized on Sunday after doctors found a blood clot.

Clinton is receiving treatment at Presbyterian Hospital in New York where doctors will monitor her for the next 48 hours, her spokesman Philippe Reines said in a statement. 

The clot, resulting from a concussion she suffered earlier in December, was found during a follow-up exam on Sunday, according to the State Department.

"Her doctors will continue to assess her condition, including other issues associated with her concussion. They will determine if any further action is required," Reines said.

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Clinton fainted and suffered a concussion earlier in the month when she was suffering from a stomach virus. At the time, the State Department said that she would continue her recovery at home and was being monitored by her physicians.

The illness forced the secretary to cancel a trip to the Middle East and an appearance before Congress.

Clinton was due to testify before Congress on Dec. 20 about the investigation into the September attack on the U.S. Consulate in Benghazi, Libya, which killed four Americans.

Two senior aides to Clinton testified on her behalf, but Republicans, who have been sharply critical of the administration’s handling of security for the Benghazi mission, have said they still expect Clinton testify in person.

Clinton has said she will step down from her post as the nation’s top diplomat, and President Obama has nominated Sen. John KerryJohn Forbes KerryTrump's dangerous Guantánamo fixation will fuel fire for terrorists Tech beefs up lobbying amid Russia scrutiny Overnight Tech: Senate Dems want FCC chief recused from Sinclair merger | Tech rallies on Capitol Hill for DACA | Facebook beefs up lobbying ranks MORE (D-Mass.) to succeed her.

— Amie Parnes contributed to this report.

— Updated at 10:03 p.m.