U.S. President Donald Trump speaks during a homecoming campaign rally at the BB&T Center on November 26, 2019 in Sunrise, Florida.
Brann said that he "has no authority to take away the right to vote of even a single person, let alone millions of citizens".
Suits filed by the campaign and its GOP allies have failed in Michigan, Georgia, Nevada and Arizona as judges declined to toss out millions of votes based on vague assertions by lawyers and sworn affidavits from voters who interpreted perceived irregularities as evidence of a Democratic conspiracy.
But they have had little success in court. He said Trump also should be applauded for forging historic peace agreements in the Middle East, facilitating the rapid development of a COVID-19 vaccine through Operation Warp Speed, appointing three "outstanding" Supreme Court justices, and keeping America safe by neutralizing ISIS and killing terrorists like Qasem Soleimani and Abu Bakr al-Baghdadi.
Critics of Trump, including Democrats and some Republicans, have accused him of trying to undermine faith in the American electoral system and delegitimize Biden's victory by promoting false claims of widespread voter fraud.
"This is what a complete ass-kicking of the president's legal effort looks like", Elias, who was involved in the Pennsylvania case, wrote on Twitter.
When asked during an interview on ABC News whether we can expect an attorney general, State Department or Treasury pick from Biden this week, Klain confirmed that the President-elect will announce cabinet appointments on Tuesday.
"As far as litigation goes I believe this is the end of the line for them", said Benjamin Geffen of the Public interest Law Center, who was also involved in the case.
With recounts and lawsuits coming up short, Mr Trump is now pressuring Republican-led state legislatures to throw out the vote totals and declare him the victor.
Looking ahead to the January 20 inauguration, Klain said it is "going to definitely have to be changed" due to the coronavirus pandemic, and that the Biden team is consulting with Democratic leadership in the House and Senate over their plans.
President-elect Joe Biden won Pennsylvania with 50% of the votes, compared to Trump's 48.8%.
That effort faces long odds. The state is due to begin certifying its results on Monday.
With Trump refusing to acknowledge the election outcome, Biden and his top aides have been denied briefings on sensitive domestic and foreign policy issues - most urgently the coronavirus pandemic battering the country.
The campaign has also suggested that hundreds of thousands of ballots in Philadelphia and Pittsburgh should be invalidated because they were allegedly counted without proper oversight by Republican observers, exposing them to potential fraud.
A presidential candidate needs 270 electoral votes to win the election, and Biden leads in the electoral vote count by 306 232. It wanted Brann to allow Pennsylvania's Republican-controlled state legislature to appoint electors who would back for Trump at the Electoral College vote on December 14.
"Fight hard Republicans", Trump said in another tweet. The Associated Press reported, "No individual county showed a variation in margin larger than 0.73%, and the variation in margin in 103 of the state's 159 counties was less than 0.05%, a memo released with the results says".