Live coverage of the US presidential election

Kathy Boockvar, the Secretary of State in Pennsylvania, has said we "definitely could" know the result in her state by the end of tonight (maybe late afternoon AEDT).

Remember, if Joe Biden wins Pennsylvania – and that seems more likely than not at the moment – he has won the election. Georgia, Nevada, Arizona, North Carolina – none of them will matter.

Joe Biden and Kamala Harris received a briefing on the state of the coronavirus pandemic today.

It is, in a word, bad. Yesterday the US reported more than 100,000 new infections, for either the first or second time (depending which network's data you follow).

The point is, daily cases in America have never been higher.

This is interesting, from CNN's White House correspondent Jim Acosta. He reports there have been discussions about Donald Trump potentially running for president again in four years, if he ends up losing.

This is definitely something that could happen. Mr Trump would be no older, essentially, than Joe Biden is now. And should he lose, he will have served just one term. The two-term limit will not be a problem.

Pennsylvania is one of those states where Joe Biden is steadily gaining on Donald Trump as the mail-in votes are counted.

Things are getting tense in the biggest city, Philadelphia.

These tweets are from Jon Ralston, editor of The Nevada Independent. No one has officially called Nevada yet but after today's numbers, hope is fading fast for the Trump campaign.

The crux of the matter is that Joe Biden is comfortably gaining votes from Clark County, where the bulk of the remaining ballots are, while Mr Trump is not gaining enough from right-leaning rural counties.

So far today, judges in two different states have denied legal challenges from the Trump campaign.

In Michigan, the campaign was suing to stop officials from counting absentee ballots, arguing that it had not been given access to observe the count.

Judge Cynthia Stephens promptly threw out the case.

In Georgia, the campaign alleged Chatham County might be mishandling ballots, based on an allegation from a Republican poll observer who said some late-arriving ballots had been mixed up with on-time ones.

"The court finds that there is no evidence that the ballots referenced in the petition were received after 7pm on election day, thereby making those ballots invalid," said Judge James Bass.

"Additionally, there is no evidence that the Chatham County Board of Elections or the Chatham County Board of Registrars has failed to comply with the law."

There was a legal victory for Mr Trump in Pennsylvania, as it won the right for observers to stand closer to election workers processing ballots in Philadelphia.

Checking in on the national popular vote, Joe Biden currently has 72.4 million votes in this election, compared to Donald Trump's 68.6 million. That's a 50.5-47.8 lead for Mr Biden.

The lead will continue to grow as the votes are counted, particularly in large Democratic states like California.

The popular vote has no bearing on the result, obviously. But it does illustrate how high turnout has been in this election. Mr Biden already has the most votes ever cast for a US presidential candidate, and when we're done, Mr Trump will have moved well clear of Barack Obama to claim second place.

The President appears to be getting around the misinformation labels on Twitter, or at least trying to, by posting his messages (still in all caps) through the Trump campaign's account instead.

Here's the latest one.

I'll reiterate, for the gazillionth time, that the states are currently counting legally cast ballots, and Mr Trump has provided no evidence to support his claims.

FiveThirtyEight reporter Kaleigh Rogers has a bit more detail from that Trump campaign media conference in Nevada.

She says the campaign claimed it had evidence of non-residents voting in the state, and said "we believe there are dead voters that have been counted".

The campaign staffers making the announcement (with the exception of Richard Grenell and Matt Schlapp) refused to give their names, telling reporters: "Do your job, it's pretty easy to find out."

They provided no evidence to support their claims.

Tense footage here from MSNBC, whose reporter Jacob Soboroff was at a media conference with Donald Trump's former director of national intelligence Richard Grenell and conservative political activist Matt Schlapp in Nevada.

The pair alleged there was widespread fraud taking place in Nevada, said Trump campaign election observers were not being allowed inside vote-counting centres, and announced a lawsuit to stop the counting of "illegal" ballots.

They did not provide any evidence to back up their claims. Soboroff tried to get some.

"Can you talk about the evidence? You're talking about thousands of illegitimate votes here in Nevada. What's the evidence?" Soboroff asked Mr Grenell after the announcement, walking alongside him.

"You should go in and ask the question of the Clark County, which you haven't done yet," Mr Grenell told him.

"No no no, you guys just made the claim. You also said there's no election observers. There's Democratic and Republican election observers inside. Mr Grenell, where's the evidence of fraud? You haven't presented any evidence of fraud?"

At that point the former DNI got into his vehicle.

A short time later Mr Grenell posted on social media, saying the lawsuit was demanding "transparency". Soboroff and other reporters replied to him, again asking for evidence of any foul play.

It has yet to be provided.