The president is continuing to claim November’s election was rigged against him, despite the lack of conclusive evidence. Since the poll the Trump campaign has launched unsuccessful legal attempts to get the result overturned in several states.
On Wednesday the president released an extraordinary 46-minute long video recorded at the White House, in which he claimed to be the victim of systematic electoral fraud.
Mr Cillizza responded on the CNN website with an article titled: “46 minutes that prove how dangerous Donald Trump is to democracy.”
He wrote: “What Trump is doing here has moved beyond laughable or embarrassing.
“It is now into the downright dangerous phase.
“There is now zero doubt about who won on November 3.
“The chief law enforcement officer in the country has acknowledged that ‘to date, we have not seen fraud on a scale that could have effected a different outcome in the election’.”
Democrat Joe Biden is on track to become the next US president with 306 electoral college votes versus 232 for Mr Trump.
He is currently leading the incumbent by over six million votes in the popular count.
READ MORE: Trump demands Supreme Court intervene and ‘overturn’ election
“Now is the time for Republicans to speak out because, if they wait much longer it will be too late.
“Endangering the pillars of our democracy for purely selfish reasons — and using the prestige and power of the presidency to do it — isn’t something that can be allowed in a healthy republic.
“No matter how afraid of the President’s Twitter feed you might be.”
Mr Biden will be inaugurated as the 46th president of the United States on January 20.
Due to the coronavirus pandemic the event is expected to be far more low-key than usual.
Mr Trump has yet to confirm whether he plans to attend.
Last month Mr Biden described his rival’s refusal to concede defeat as “an embarrassment”.
During his 46-minute long video the president said: “This election was rigged. Everybody knows it.
“I don’t mind if I lose an election, but I want to lose an election fair and square.
“What I don’t want to do is have it stolen from the American people.”