Biden’s choice not to step aside denied Democrats a chance for renewal — and paved the way for Trump’s return.

Biden officials harbor deep worries in particular about the fate of their work abroad, where Trump is expected to abruptly shift the U.S.' priorities. The administration is racing to ship a last batch of aid to Ukraine before Jan. 20, for fear Trump will immediately cut off support for the country’s defense against Russia.

Donald Trump made a triumphant return to the White House on Wednesday, where outgoing president Joe Biden offered a show of civility to the bitter rival who denied him the same courtesy four years ago.