"This allegation of electoral fraud is disputed and this tweet cannot be answered, retweeted or liked due to the risk of violence," the social media alert to the tweet said.
Earlier in Washington, clashes broke out between Trump supporters and the police.
The clashes led to the use of tear gas by law enforcement agencies.
Later it was reported that protesters broke into the Capitol and surrounded the Senate Hall.
In his video message, Trump urged his supporters to go home.