Watch this C-SPAN Cable video (1:02:16–):
https://www.c-span.org/video/?470538-1/president-trump-closes-us-mexico-border-essential-travel&start=3762#

Note that the United States Secretary of Health and Human Services, Alex Azar, at a journalist’s question, stated that the CDC was notified by China about a viral pneumonia of unknown cause on the 3rd of January!

(CDC: Center for Disease Control and Prevention, a United States government public health agency)

Transcript by C-SPAN:

Journalist:
I have two questions. The first is to Secretary Pompeo.
«NewsHour» has learned that the CDC picked up that there was some sort of virus happening in Wuhan - the coronavirus happening in Wuhan, as early as December.
When did the CDC start letting other agencies know that there was something in China happening - that this coronavirus was happening?
And when did the whole-of-government approach start to happen?

Mike Pompeo:
So I'll let the CDC - or, Dr. Fauci, do you want to talk to that?
(Dr. Fauci, an physician and immunologist, did not want to answer)

Mike Pompeo:
Yeah, Secretary Azar, please.

Alex Azar, US Secretary of Health and Human Services:
«So we were alerted by some discussions that Dr. Redfield, the Director of the CDC, had with Chinese colleagues on January 3rd. It's since been known that there may have been cases in December, not that we were alerted in December.»

Xinhua’s coronavirus timeline:
Monday Dec. 30, 2019
-- The Wuhan Municipal Health Commission issued an urgent notification to medical institutions under its jurisdiction, ordering efforts to appropriately treat patients with pneumonia of unknown cause.

Tuesday Dec. 31, 2019
-- The National Health Commission (NHC) made arrangements in the wee hours, sending a working group and an expert team to Wuhan to guide epidemic response and conduct on-site investigations.
-- The Wuhan Municipal Health Commission released a briefing on its website about the pneumonia outbreak in the city, confirming 27 cases and telling the public not to go to enclosed public places or gather. It suggested wearing face masks when going out.
-- Starting Dec. 31, 2019, the Wuhan Municipal Health Commission released briefings on the pneumonia outbreak in accordance with the law.

Wednesday Jan. 1
-- The NHC set up a leading group to determine the emergency response to the epidemic. The group convened meetings on a daily basis since then.

Thursday Jan. 2
-- The Chinese Center for Disease Control and Prevention (China CDC) and the Chinese Academy of Medical Sciences (CAMS) received the first batch of samples of four patients from Hubei Province and began pathogen identification.
-- The NHC came up with a set of guidelines on early discovery, early diagnosis and early quarantine for the prevention and control of the viral pneumonia of unknown cause.

Friday Jan. 3
-- Starting Jan. 3, China has been regularly informing the WHO, relevant countries and regions and China's Hong Kong, Macao and Taiwan about the pneumonia outbreak.
-- China began to inform the United States of the pneumonia outbreak and response measures on a regular basis.
-- The Wuhan Municipal Health Commission updated briefing on its website about the situation of viral pneumonia of unknown cause, reporting a total of 44 cases of viral pneumonia of unknown cause.
-- The NHC organized the China CDC and three other institutions to carry out parallel laboratory testing of the samples for pathogen identification.
-- The NHC and the Health Commission of Hubei Province jointly worked out nine documents on the outbreak, including a trial version of guidelines on the diagnosis and treatment of viral pneumonia of unknown cause.