US President Donald Trump's campaign on Saturday said it would challenge the results of the presidential election in the courts after Democratic challenger Joe Biden was declared the winner by several television networks.

Below is a list of the cases that will play out in the coming days and possibly weeks. Trump's campaign said on Saturday more litigation would be filed in the coming days.

Pennsylvania litigation

Several court battles are pending in the battleground state of Pennsylvania.

The Trump campaign is fighting Philadelphia election officials over vote counting in the city, which continued on Saturday. A state court on Thursday granted the campaign closer access to the proceedings, a ruling that officials have appealed.

The City of Philadelphia Board of Elections has said its observation rules were needed for security reasons and to maintain social distancing protocols.

On Wednesday, Trump's campaign filed a motion to intervene in a case pending before the US Supreme Court challenging a decision from the state's highest court that allowed election officials to count mail-in ballots postmarked by Tuesday's Election Day that are delivered through Friday.

US Supreme Court Justice Samuel Alito on Friday night ordered county election boards in the state to separate mail-in ballots received after 8 p.m. EST on Election Day from other ballots.

Pennsylvania election officials have said the late-arriving ballots were already being separated.

The justices previously ruled there was not enough time to decide the merits of the case before Election Day but indicated they might revisit it afterwards.

Alito, joined by fellow conservative Justices Clarence Thomas and Neil Gorsuch, said in a written opinion that there is a 'strong likelihood' the Pennsylvania court's decision violated the US Constitution.

Pennsylvania's Secretary of the Commonwealth Kathy Boockvar has said late-arriving ballots are a tiny proportion of the overall vote in the state.

Nevada

A voter, a member of the media and two candidate campaigns sued Nevada's secretary of state and other officials to prevent the use of a signature-verification system in populous Clark County and to provide public access to vote counting.

A federal judge rejected the request on Friday, saying there was no evidence the county was doing anything unlawful.

Georgia ballot fight

The Trump campaign on Wednesday filed a lawsuit in state court in Chatham County that alleged late-arriving ballots were improperly mingled with valid ballots, and asked a judge to order late-arriving ballots be separated and not be counted.

The case was dismissed on Thursday.

Michigan ballot-counting fight

Trump's campaign on Wednesday filed a lawsuit in Michigan to halt the vote count in the state. The lawsuit alleged that campaign poll watchers were denied 'meaningful access' to counting of ballots, plus access to surveillance video footage of ballot boxes.

On Thursday, Michigan Court of Claims Judge Cynthia Stephens dismissed the case, saying there was no legal basis or evidence to halt the vote and grant requests.

US postal service litigation

The US Postal Service said about 1,700 ballots had been identified in Pennsylvania at processing facilities during two sweeps on Thursday and were being delivered to election officials, according to a court filing early Friday.

The Postal Service said 1,076 ballots, had been found at its Philadelphia Processing and Distribution Center. About 300 were found at the Pittsburgh processing center, 266 at a Lehigh Valley facility and others at other Pennsylvania processing centers.

US District Judge Emmet Sullivan in Washington is overseeing a lawsuit by Vote Forward, the NAACP, and Latino community advocates.

Sullivan on Thursday ordered twice-daily sweeps at USPS facilities serving states with extended ballot receipt deadlines. The judge plans to hold a status conference on Monday.

*Reuters

US President Donald Trump's campaign on Saturday said it would challenge the results of the presidential election in the courts after Democratic challenger Joe Biden was declared the winner by several television networks.

Below is a list of the cases that will play out in the coming days and possibly weeks. Trump's campaign said on Saturday more litigation would be filed in the coming days.

Pennsylvania litigation

Several court battles are pending in the battleground state of Pennsylvania.

The Trump campaign is fighting Philadelphia election officials over vote counting in the city, which continued on Saturday. A state court on Thursday granted the campaign closer access to the proceedings, a ruling that officials have appealed.

The City of Philadelphia Board of Elections has said its observation rules were needed for security reasons and to maintain social distancing protocols.

On Wednesday, Trump's campaign filed a motion to intervene in a case pending before the US Supreme Court challenging a decision from the state's highest court that allowed election officials to count mail-in ballots postmarked by Tuesday's Election Day that are delivered through Friday.

US Supreme Court Justice Samuel Alito on Friday night ordered county election boards in the state to separate mail-in ballots received after 8 p.m. EST on Election Day from other ballots.

Pennsylvania election officials have said the late-arriving ballots were already being separated.

The justices previously ruled there was not enough time to decide the merits of the case before Election Day but indicated they might revisit it afterwards.

Alito, joined by fellow conservative Justices Clarence Thomas and Neil Gorsuch, said in a written opinion that there is a 'strong likelihood' the Pennsylvania court's decision violated the US Constitution.

Pennsylvania's Secretary of the Commonwealth Kathy Boockvar has said late-arriving ballots are a tiny proportion of the overall vote in the state.

Nevada

A voter, a member of the media and two candidate campaigns sued Nevada's secretary of state and other officials to prevent the use of a signature-verification system in populous Clark County and to provide public access to vote counting.

A federal judge rejected the request on Friday, saying there was no evidence the county was doing anything unlawful.

Georgia ballot fight

The Trump campaign on Wednesday filed a lawsuit in state court in Chatham County that alleged late-arriving ballots were improperly mingled with valid ballots, and asked a judge to order late-arriving ballots be separated and not be counted.

The case was dismissed on Thursday.

Michigan ballot-counting fight

Trump's campaign on Wednesday filed a lawsuit in Michigan to halt the vote count in the state. The lawsuit alleged that campaign poll watchers were denied 'meaningful access' to counting of ballots, plus access to surveillance video footage of ballot boxes.

On Thursday, Michigan Court of Claims Judge Cynthia Stephens dismissed the case, saying there was no legal basis or evidence to halt the vote and grant requests.

US postal service litigation

The US Postal Service said about 1,700 ballots had been identified in Pennsylvania at processing facilities during two sweeps on Thursday and were being delivered to election officials, according to a court filing early Friday.

The Postal Service said 1,076 ballots, had been found at its Philadelphia Processing and Distribution Center. About 300 were found at the Pittsburgh processing center, 266 at a Lehigh Valley facility and others at other Pennsylvania processing centers.

US District Judge Emmet Sullivan in Washington is overseeing a lawsuit by Vote Forward, the NAACP, and Latino community advocates.

Sullivan on Thursday ordered twice-daily sweeps at USPS facilities serving states with extended ballot receipt deadlines. The judge plans to hold a status conference on Monday.

*Reuters