On Wednesday, US Supreme Court rejected the Pennsylvania Republican Party's second attempt to eliminate a three-day deadline extension for the receipt of mail-in ballots in the upcoming November 3 election.
"Donald Trump is trying to sow chaos and confusion in the process. The good news is the voters are really drowning him out," Shapiro told CNN.
Shapiro noted that more than 2 million Pennsylvania residents had already voted, but charged that president Trump may try to use delays in the vote counting to his advantage.
"Trump is trying to undermine the Pennsylvanians' will", Shapiro said.
Trump has said the Democrats' attempt to encourage millions of citizens to vote by mail as well as extend election deadlines may lead to ballot harvesting and election fraud.
As of Friday morning, more than 84 million Americans have cast ballots early and 54 million ballots have been submitted via mail, according to the US Elections Project.