I withdrew the United States from the unfair and one sided Paris climate accord.

Earlier on Sunday, he used his final G 20 summit to defend his decision to withdraw the United States from the Paris climate accord, a move that took effect a day after the presidential election.

Since Biden was declared the winner, Trump has launched a barrage of lawsuits and mounted a pressure campaign to prevent states from certifying their vote totals.

So far, those attempts have failed in Georgia, Michigan and Arizona.

And on Saturday, Matthew Bran, a Republican federal judge, tossed out a similar effort in Pennsylvania, writing that the case amounted to strained legal arguments without merit and speculative accusations.

On Sunday, the Trump campaign gave notice in a court filing that it will appeal the loss in Pennsylvania.

But Republican Senator Pat Toomey of Pennsylvania said the judge's ruling closed off any chance for legal victory in the state and called on Trump to concede the election, and Republican Congresswoman Liz Cheney also called on Trump to respect quote the sanctity of our electoral process if he does not succeed in court transition now.

Meanwhile, Senate Democratic leader Chuck Schumer on Sunday urged Trump to begin the transfer of power, saying the health of the American people depend on it during the pandemic.

Biden is pressing ahead with his incoming administration.

On Tuesday, he's expected to announce some of the first members of his Cabinet, and his chief of staff said plans are in the works for a scaled down inauguration that follows public health guidelines.