Snopes reports:
One of the many pieces of misinformation repeated by President Donald Trump and his legal team, in an effort to dispute the results of Trump’s 2020 election loss to Joe Biden, was the claim that the number of mail-in votes recorded in Pennsylvania greatly exceeded the number of mail-in ballots requested.
This claim was egregiously wrong, however. The 1.8 million figure represents the number of mail-in ballots that Pennsylvania reported had been requested by persons registered as Democrats as of the voter registration deadline of Oct. 19.
That figure did not include the hundreds of thousands of mail-in ballots that were also requested by persons registered as Republicans (or persons registered with third parties affiliations or with no party affiliation) as of that date.
The 1,126,940 votes were created out of thin air. I won Pennsylvania by a lot, perhaps more than anyone will ever know. The Pennsylvania votes were RIGGED. All other swing states also. The world is watching! https://t.co/zmnk34Ny23
— Donald J. Trump (@realDonaldTrump) November 28, 2020