Democrat Joe Biden has been declared president-elect, but Donald Trump is challenging the result in some key states, alleging electoral fraud.
The president has been dealt a series of legal blows, as time runs out for him overturn the results.
Here’s what we know so far.
Electors from each state meet on 14 December to formally nominate the next president.
Realistically, this is the point at which the window closes for legal challenges, although there are remote scenarios where cases could continue beyond this date.
Mr Biden is projected to have won here.
The Trump campaign is seeking to block the certification of the results in the state, alleging unfair voting practises.
President Trump’s legal team say voters in Democrat-leaning areas were given more of an opportunity to correct any mistakes on their postal ballots – but on 21 November a judge in Pennsylvania rejected their case, saying it presented “strained legal arguments without merit”.
On 22 November, Trump’s team confirmed they were appealing against the decision.
In the lawsuit, they also allege more than 680,000 postal ballots were counted without proper oversight from poll watchers.