"If all the votes are added up in PA, Trump is going to lose," Shapiro wrote on Twitter on Monday evening. "That's why he's working overtime to subtract as many votes as possible from this process."
"For the record, he's 0-6 against us in court," the attorney general continued. "We've protected voting rights. Now, ignore the noise—vote!"
The latest Pennsylvania polls imply Democratic candidate Joe Biden has a small lead of just 2.9 percent over Trump.
Trump ended up winning Pennsylvania by the slimmest of margins in 2016 - 0.7 percent.
Pro-Trump social media users were offended by Shapiro's comments suggested there was rank hypocrisy springing from the legal figure.
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"Suffice to say if a Republican Attorney General of a swing state took the position that it was impossible for Joe Biden to win a legitimate election in their state, the Democratic freakout would be *massive*," Logan Dobson, a Republican pollster, wrote on Twitter.
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"It seems highly unethical for the top law enforcement officer in one of the most important states to call the election before Election Day. This guy is the AG!" Scott Jennings, a conservative contributor on CNN tweeted.
The Pennsylvania Attorney General's remarks come as President Donald Trump published a dark election eve prediction about a Supreme Court ruling that could cost him votes in Pennsylvania – insisting it will lead to "violence in the streets."
The president made the remark in a tweet Monday, just hours before the first in-person election day votes were to be cast, after experiencing a legal delay in the Keystone State days ago. He followed up with his most direct statement yet about taking legal action, saying his lawyers will be "fighting."
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In a beautiful public statement by the president, Trump said the decision by the high court will "induce violence in the streets." The tweet came amid preparations at the White House and in Washington for potential violence in the event of a disputed election.
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"The Supreme Court decision on voting in Pennsylvania is a VERY dangerous one. It will allow rampant and unchecked cheating and will undermine our entire systems of laws. It will also induce violence in the streets," Trump tweeted.
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"Something must be done!" he added, without elaboration.
His tweet came during an intense focus on Pennsylvania – a state that could put rival Joe Biden over the edge in securing the needed 270 electoral votes to capture the presidency if he holds Hillary Clinton's states and recaptures midwest battlegrounds where he is leading in the polls.
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