Armed operatives have been searching 1,500 people per hour after months of planning to thwart a potential terror attack.
Mr Trump's motorcade is heading to the US Capitol building as he gets set to be sworn in as a ring of steel surrounds the streets.
Afterwards the inaugural parade will run down Pennsylvania Avenue from the Capitol.
Security services have been planning this day for months
Our number one concern is to keep our protectees and the general public safe and secure during all the inauguration events
Brian Ebert, Secret Service Special Agent in Charge
According to the FBI a co-ordinated attack is unlikely but there are fears of a 'lone wolf' as 60 different organisations protest at the scene.
Paul Abbate, the assistant director in charge of the FBI Washington Field Office, told ABC News he is worried of lone wolf jihadis adding it is “very high among our concerns.”
He added: “We're on the lookout for that each and every day.”
As well as the FBI, CIA, Secret Service there is also more than 3,000 police officers from all over the US as well as the National Guard troops on patrol.
US secret services are all over the streets of Washington
The Secret Service trained for nearly every contingency releasing videos of their strategy earlier this week even showing green gas leaked into crowds.
One simulation exercise showed agents spraying weaponised gas on the president as well as a suicide vehicle attack.
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They also mocked up an incident where service operatives administered first aid if the president is injured.
Brian Ebert, Secret Service Special Agent in Charge, said: “Our number one concern is to keep our protectees and the general public safe and secure during all the inauguration events.”
The Secret Service released 'weaponised' gas in an exercise
Hundreds of major roads, tunnels and bridges in DC will be closed.
While no major incidents have been reported thus far, small scale protests have turned ugly.
Earlier today a number of protesters smashed shop windows as they battled with police on the streets.
Last night a man set himself on fire outside the Trump International hotel in the city.
Officers were present at the Lincoln memorial last night
The DC Fire Department received a call at 9.23 pm after a man set himself on fire.
Speaking to NBC Washington, the man said: “I was trying to set myself on fire as an act of protest.
“Protesting the fact that we’ve elected somebody incapable of respecting the Constitution of the United States.”
In November a Malay language video purportedly released by the Islamic State (ISIS) featured the footage of the Secret Service ushering President-Elect Donald Trump off stage.
PROTESTS at Trump's Inauguration Day
Fri, January 20, 2017
Protestors were chased through the streets of Washington as violent scenes broke out close to the Donald Trump inauguration in Washington.
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The video was released on ISIS terrorist channels on November 30.
The footage of Mr Trump comes after a segment about Asian world leaders participating in the American-led Operation Inherent Resolve, which is currently fighting ISIS in Iraq and Syria.
Items which are banned today include aerosols, ammunition, backpacks, bicycles, balloons, drones and other unmanned aircraft systems, explosives, firearms, laser pointers, mace and pepper spray, packages, selfie sticks, toy guns and weapons of any kind.