And considering what he said here?
Because their deep state puppet masters are telling them to say it, in order to demoralize Trump supporters.
Every Trump supporter needs to send a letter to President Trump demanding an audit of the whole election process including the involvement of the Post Office. Emails and texts can be discredited as "bots" but not a letter.
If he gets enough letters he will serve his constituents and have the system audited. Is your freedom worth $.55 for a stamp?