U.S. President-elect Joe Biden plans to name the first members of his Cabinet on Tuesday, a key aide said Sunday, even as President Donald Trump urged Republicans to help him in his long-shot legal effort to overturn his reelection defeat.

Ron Klain, Biden’s incoming White House chief of staff, declined in an interview on ABC’s “This Week” show to say which agency heads Biden would name. But the president-elect said last week he had settled on a new Treasury secretary and that his selection would appeal to “all elements of the Democratic Party ... progressive to the moderate coalitions."

While Biden is transitioning to become the country’s 46th president at his inauguration on January 20, Trump has refused to concede. On Sunday, the outgoing U.S. leader told his followers on Twitter, “We will find massive numbers of fraudulent ballots. ... Fight hard Republicans.”

But Trump’s legal fight has been fruitless so far, with his campaign losing or withdrawing 34 lawsuits claiming vote and vote-counting fraud in key battleground states Biden was projected to win to claim a four-year term in the White House.

Trump has not upended the vote count in any state, leaving intact Biden’s unofficial 306-232 majority vote in the Electoral College. It determines U.S. presidential elections, not the national popular vote, although Biden leads there, too, by more than 6 million votes.

Trump’s latest legal defeat contesting the election came late Saturday in Pennsylvania, whose 20 electoral votes Biden won by an 81,000-vote margin after Trump won the state over Democrat Hillary Clinton in 2016 en route to the presidency.

U.S. District Judge Matthew Brann declared that the Trump campaign had presented “strained legal arguments without merit and speculative accusations” in its effort to throw out millions of votes and hand the state’s electoral votes to Trump.

“In the United States of America, this cannot justify the disenfranchisement of a single voter, let alone all the voters of its sixth most populated state,” Brann wrote.

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