evidence: President Joe Biden has begun undoing some inherited policies via executive orders, yet much of what the new administration ultimately hopes to achieve cannot be accomplished by presidential fiat. Like Trump when he was reversing Obama-era regulations, Biden will need cooperation from Congress, including compromises with at least some Republicans in the Senate, to enact significant swaths of his agenda, and he faces a ticking clock to undo some of Trump’s "midnight" rules. [...] ProPublica tracked more than 75 such regulations from Trump’s final months in office, at least 50 of which were finalized before Biden’s inauguration. [...] On his first day in office, Biden issued an executive order describing the wall as a "waste of money that diverts attention from genuine threats to our homeland security." The order pauses construction and spending on the wall "to the extent permitted by law," leaving open the possibility that construction could continue or that money will continue to be spent on the project. Our investigation confirmed that some wall contracts come with hefty termination fees. One agreement stipulates a cancellation fee of nearly $15 million.