Republican Senator Pat Tommy said the ruling closed off any chance for a legal victory in Pennsylvania and called on Trump to drop the election.
Im no gree accept di result and im dey claim say plenty mago-mago dey di election, without providing any evidence.
H. R. McMaster, Trump's former national security adviser, said on CBS that Trump's failure to accept the election results was "corrosive", and played into Russia's hands by undermining faith in democracy and US institutions.
Trump was to prevail there, he would still need to take the lead in at least two other states to reach the 270 electoral votes required to win the White House.
The lawsuit sought to block Pennsylvania from certifying the vote count, claiming election officials took part in an "improper scheme" to benefit President-elect Joe Biden, who won the state.
Brann described the case as "strained legal arguments without merit and speculative accusations".
"In the United States of America, this can not justify the disenfranchisement of a single voter, let alone all the voters of its sixth most populated state", the opinion said.
In Pennsylvania, the Trump campaign tried to argue that millions of votes in Pennsylvania should be invalidated because some counties incorrectly allowed voters to fix their ballots in the event that they made an error.
"Today's decision turns out to help us in our strategy to get expeditiously to the US Supreme Court", he stated in an announcement, including that the the Trump marketing campaign will now ask the third US Circuit Courtroom of Appeals in Philadelphia to evaluate the ruling on an accelerated timetable.
Trump's lawyers also expressed disappointment over their lack of opportunity to "present our evidence" at a hearing.
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That is the only thing in our mind. "Messi is a Barcelona player". "I didn't think about anywhere else, just to stay here", he said.
Brann called the legal reasoning behind the Trump campaign's Equal Protection claim "Frankenstein's Monster".
Trump has rarely appeared in public since his electoral loss, but has not given up on his provocative Twitter campaign.
Meanwhile, Georgia certified its results on Friday after a hand recount that found no major change in the vote totals, with other key states set to certify results in the coming days and weeks. Potential contenders for top spots in the administration have included longtime Democratic aides as well as some of Biden's former rivals in the 2020 presidential campaign.
"It's corrosive, it's harmful, but... it's not going to change the outcome of what happens here at 12 noon on January 20: Joe Biden will become the next president of the United States".
"We're beginning to look like a banana republic", Maryland's Republican Governor Larry Hogan told CNN's "State of the Union" program, criticizing the refusal of many in his own party to acknowledge Trump's defeat.
The counties in the state are due to certify their election results on Monday.
Mr Biden, who has denounced Mr Trump's attempt to reverse the election results as "totally irresponsible", spent Sunday meeting with transition advisers and attending church.
Since Mr Biden was declared the victor two weeks ago, Mr Trump has launched a barrage of lawsuits and mounted a pressure campaign to prevent states from certifying their vote totals.
During the campaign, Biden severely criticised Trump's go-it-alone foreign policy and pledged to recommit to North Atlantic Treaty Organisation and other global pacts, while promising to draw on experts to fight the COVID crisis and other problems at home. "If they have genuine evidence of this, they are obligated to present it immediately in court and to the American people".