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Sen. Pat Toomey during a Senate hearing in May. Photo: Alex Wong/Getty Images

Sen. Pat Toomey (R-Pa.) congratulated President-elect Joe Biden on his election win, saying in a statement, "President Trump has exhausted all plausible legal options to challenge the result of the presidential race in Pennsylvania."

Why it matters: Toomey made the announcement hours after a Republican judge in his home state dismissed a Trump campaign lawsuit that sought to block the certification of Pennsylvania's election results.

"To ensure that he is remembered for these outstanding accomplishments, and to help unify our country, President Trump should accept the outcome of the election and facilitate the presidential transition process."
— Toomey

Flashback: Toomey said on Nov. 11 that it's "not 100% certain but it is quite likely" that Biden had won the election and that "a transition process ought to begin."

Editor's note: This article has been updated with new details throughout.

Go deeper

Off the Rails

Episode 1: A premeditated lie lit the fire

Photo illustration: Sarah Grillo/Axios. Photo: Chip Somodevilla/Getty Images

Beginning on election night 2020 and continuing through his final days in office, Donald Trump unraveled and dragged America with him, to the point that his followers sacked the U.S. Capitol with two weeks left in his term. This Axios series takes you inside the collapse of a president.

Episode 1: Trump’s refusal to believe the election results was premeditated. He had heard about the “red mirage” — the likelihood that early vote counts would tip more Republican than the final tallies — and he decided to exploit it.

"Jared, you call the Murdochs! Jason, you call Sammon and Hemmer!”

Off the Rails

Episode 6: Last stand in Georgia

Photo illustration: Aïda Amer/Axios. Photo: Drew Angerer, Raymond Boyd/Getty Images

Beginning on election night 2020 and continuing through his final days in office, Donald Trump unraveled and dragged America with him, to the point that his followers sacked the U.S. Capitol with two weeks left in his term. Axios takes you inside the collapse of a president with a special series.

Episode 6: Georgia had not backed a Democratic presidential candidate since 1992 and Donald Trump's defeat in this Deep South stronghold, and his reaction to that loss, would help cost Republicans the U.S. Senate as well. Georgia was Trump's last stand.

On Air Force One, President Trump was in a mood. He had been clear he did not want to return to Georgia, and yet somehow he'd been conscripted into another rally on the night of Jan. 4.

Off the Rails

Episode 8: The siege

Photo illustration: Aïda Amer/Axios. Photos: Mandel Ngan/AFP via Getty Images

Beginning on election night 2020 and continuing through his final days in office, Donald Trump unraveled and dragged America with him, to the point that his followers sacked the U.S. Capitol with two weeks left in his term. Axios takes you inside the collapse of a president with a special series.

Episode 8: The siege. An inside account of the deadly insurrection at the Capitol on Jan. 6 that ultimately failed to block the certification of the Electoral College. And, finally, Trump's concession.

On Jan. 6, White House deputy national security adviser Matt Pottinger entered the West Wing in the mid-afternoon, shortly after his colleagues' phones had lit up with an emergency curfew alert from D.C. Mayor Muriel Bowser.