Joe Biden has been declared president-elect, but President Trump is planning legal challenges in some key states

The Trump campaign says it plans to lodge lawsuits today

Here's what we know so far from #BBCRealityCheck

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https://bbc.in/2GHQrFj 

In Pennsylvania, the Trump campaign has filed a lawsuit accusing election officials of violating a judge's orders to allow observers six feet from the vote counting

But election officials say that watchers were able to observe the process unimpeded

https://bbc.in/2GHQrFj 

Another challenge in Pennsylvania is whether to count ballots postmarked by election day but arriving up to three days later

The US Supreme Court was deadlocked on this decision before the election

https://bbc.in/2GHQrFj 

In Michigan, which is projected for Biden, Trump's campaign filed a lawsuit to stop the count over claims of a lack of access to observe the process

A judge dismissed the suit, saying there was insufficient evidence that procedures weren't being followed

https://bbc.in/2GHQrFj 

In Wisconsin, the Trump campaign is requesting a recount in "based on abnormalities seen" on election day although this doesn't require legal action

We don't know when they would re-count as they'd normally wait until officials finish reviewing the votes

https://bbc.in/2GHQrFj 

The Nevada Republican Party claim “Thousands of individuals... appear to have violated the law by casting ballots after they moved from Nevada”

But Clark County's registrar, where the case is focused, says: "We are not aware of any improper ballots"
https://bbc.in/2GHQrFj 

Also in Nevada, a federal judge blocked attempts by the Republicans to stop the use of a signature verification machine, rejecting allegations that it wasn't able to check signatures correctly

https://bbc.in/2GHQrFj 

In Georgia, Republicans filed a suit to pause a count, alleging observers saw a woman "mix over 50 ballots into the stack of uncounted absentee ballots"

A judge has dismissed this lawsuit, saying there was "no evidence" of improper ballot mixing

https://bbc.in/2GHQrFj 

In Arizona Trump's campaign has filed a lawsuit claiming legal votes were rejected

They cite declarations by some poll watchers and two voters who claim they had problems with voting machines Arizona's Secretary of State said it was "grasping at straws"

https://bbc.in/2GHQrFj 

Trump has claimed voting fraud - without providing evidence - and said: "We'll be going to the US Supreme Court"

But there are a few steps that any case would have to get through before reaching the Supreme Court
https://bbc.in/2GHQrFj 

For more about potential legal actions check out #BBCRealityCheck here https://bbc.in/2GHQrFj