Meanwhile planned campaign stops have been dropped by the presidential candidate as she modifies her schedule following doctor's orders.
The 68-year-old was rushed out of a 9/11 commemoration service suffering from a “medical episode”, according to a law enforcement witness.
A video later emerged of the Democratic presidential nominee, showing the dramatic moment when her "knees buckled" and she nearly crumpled to the pavement while waiting for a car to collect her.
Now sources have claimed Democratic Party insiders are rushing to consider a replacement candidate in light of Mrs Clinton's poor health.
Emmy Award winning New York Journalist and MSNBC pundit David Shuster tweeted: "Clarification from dem operatives @HillaryClinton pneumonia: Expect emergency DNC meeting to CONSIDER replacement."
But a senior democrat has revealed that while the committee may "plead" with Ms Clinton for her to step down, the decision is ultimately down to her.
A top source in the party reportedly said: "We can make contingencies, argue, plead with Hillary Clinton, but DNC bylaws are clear – her nominee status is now totally up to her."
The campaign has confirmed that Ms Clinton will not attend scheduled campaign stops in California over the next two days, with no comment on events after that.
Lisa Bardack, Clinton’s doctor said: “Secretary Clinton has been experiencing a cough related to allergies.
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