Details are emerging of a raft of executive orders planned by US president-elect Joe Biden as soon as he takes office this week.

Mr Biden will issue decrees to reverse President Trump's travel bans and re-join the Paris climate accord on his first day, US media reports.

He is also expected to focus on reuniting children separated from families at the border and issue mandates on Covid-19 and mask-wearing.

Mr Biden will be inaugurated Wednesday.

All 50 US states are on high alert for possible violence in the run-up to the inauguration ceremony, with National Guard troops deployed in their thousands to guard Washington DC.

What policy changes will Mr Biden enact?

In the hours after Mr Biden sets foot in the White House, he will embark on a blitz of executive actions designed to signal a clean break from his predecessor's administration, according to a memo seen by US media.

Among the orders planned soon after taking office are:

• A US return to the Paris climate agreement - the global pact on cutting carbon emissions
• Repealing the controversial travel ban on mostly Muslim-majority countries
• Mandating the wearing of masks on federal property and when travelling interstate
• An extension to nationwide restrictions on evictions and foreclosures due to the pandemic

The executive orders are just one part of his ambitious plan for his first 10 days in office, according the memo.

The President-elect is also expected to send a major new immigration bill to Congress as well as focusing on passing a $1.9tn (£1.4tn) stimulus plan to help the country's economy recover from coronavirus.

Mr Biden has also said his administration will aim to deliver 100 million Covid-19 jabs in his first 100 days in office - describing the rollout so far as a "dismal failure".

"President-elect Biden will take action - not just to reverse the gravest damages of the Trump administration - but also to start moving our country forward," incoming White House Chief of Staff Ron Klain wrote in the memo.

What challenges does Biden face?

The president-elect is taking over a country in the midst of an unprecedented pandemic. Daily deaths from Covid-19 are in their thousands and almost 400,000 have lost their lives.

On top of the virus raging, the country is reeling from recent political violence.

The theme for Mr Biden's inauguration will be "America United" with the president-elect focusing on healing political divisions. Vice-President Mike Pence is expected to attend the ceremony, though Mr Trump has said he will not.

Mr Biden will be sworn in exactly two weeks after the violent riots at the US Capitol on 6 January which aimed to thwart his election victory.

Even by inauguration standards, the security presence in Washington DC for Wednesday's ceremony is extraordinary.

Miles of streets have been blocked off with concrete barriers and metal fences, with more than 20,000 National Guard expected to deploy. The FBI has warned of more possible violence and armed marches planned by pro-Trump supporters.

The tough security measures follow a week in which Donald Trump became the first US president to be impeached twice. Mr Trump will now face a Senate trial on a charge of "incitement of insurrection" for the US Capitol violence.

The earliest the Senate can receive the charges will be Tuesday - the day before he leaves office - but the timings for the trial remain unclear.

There is some suggestion that the House of Representatives, which voted to impeach him last week, could delay sending the articles to the Senate to let Mr Biden push on with his legislative agenda and have his cabinet picks approved first.

Democrats and Republicans are also reportedly discussing plans for a "dual track" agenda which would allow for the Senate to split time between impeachment proceedings and Biden administration business.

The 100-seat Senate is now tied between Republicans and Democrats. A two-thirds majority is needed for an impeachment conviction - so 17 Republicans would need to vote against Mr Trump to convict him.

Some Republicans on Wednesday warned that impeachment would further inflame and divide Americans at a time when the nation needs to heal - but Democrats want to push on to convict Mr Trump then block him running from office again.

Ten Republicans voted to impeach the president in the House and most Republican senators, including leader Mitch McConnell, have not said publicly what their voting intentions in a trial are yet.

A president has never been tried after he leaves office. Because the situation is unprecedented, some have even suggested it could be unconstitutional.

Statement On President Trump’s Impeachment Defense Team:

President Trump has not yet made a determination as to which lawyer or law firm will represent him for the disgraceful attack on our Constitution and democracy, known as the “impeachment hoax.” We will keep you informed.

— J. Hogan Gidley (@JHoganGidley) January 17, 2021

But officials on both sides are preparing for a trial though the outgoing president is yet to confirm his legal team.

Mr Trump's personal lawyer, Rudy Giuliani, told ABC News on Sunday that he was working on the impeachment defense but a spokesman for the president later denied he had decided on his representation yet in a statement which described the effort as a "hoax".