A huge wall is set to be erected around the White House, increasing the already heavy security around the complex.
It comes as Donald Trump continued to fuel fears he plans to claim victory in the election before votes are counted.
The perimeter around the ‘People’s House’ had already been extended in July this year, following Black Lives Matter protests in the capital.
About the length of a football pitch has been added to the security area on the north side.
And a tall, anti-climb fence was erected at the edge of the south lawn, meaning visitors can only see the very top of the building.
Now, reports suggest a similar, impenetrable fence will be erected from Lafayette Square in the north to the cover the ‘Ellipse’ to the south – a vast increase in the off-limits area.
President Trump is expected to throw a party for 400 guests at the White House on election night.
It comes after businesses near the White House began boarding up their windows in anticipation of unrest on election night.
Banks, shops and restaurants across several blocks in Downtown Washington DC have erected wood panelling across their glass-fronted buildings, with the election just days away.
But local officials have told business owners there is no need to take such drastic precautions.
Some firms had already covered their windows in the Summer, some because of Covid-19 closures and others over protests following the death of George Floyd.
But locals say the number of boarded up buildings has rocketed in recent days.
“It’s all happened this week,” one resident told the Mirror. “It’s crazy.”
Some 250 National Guardsmen are reportedly ‘on standby’ for Tuesday night.
Americans have rushed to vote early, already casting nearly 60 million mail-in ballots that could take days or weeks to be counted in some states – meaning a winner might not be declared in the hours after polls close on Tuesday night.
But Trump is reportedly planning to claim victory on election night if it appears he is in the lead on the night.
“I don’t think it’s fair that we have to wait for a long period of time after the election,” Trump told reporters before a rally in North Carolina.
Some states, including Pennsylvania, do not start processing mail-in votes until Election Day, slowing the process.
Trump has said repeatedly without evidence that mail-in votes are prone to fraud, although election experts say that is rare in U.S. elections.
Mail voting is a long-standing feature of American elections, and about one in four ballots was cast that way in 2016.
“We’re going in the night of – as soon as the election is over – we’re going in with our lawyers,” he added.
Biden told reporters between campaign stops in Philadelphia: “The president’s not going to steal this election.”