The former vice-president, who was seen in the company of Senate President, Bukola Saraki, is scheduled to speak at the Chamber of Commerce in Washington DC on Friday, from 2:30 pm to 4 pm local time.
The private roundtable, to be hosted by the US Chamber of Commerce and the US Africa Business Centre, is going to hold at 1615 H Street, NW 20062.
Photos of his arrival were shared on Twitter by PDP supporters.
Below are the first photos of Atiku in America:
Concise News reports that media Advisers to Atiku Abubakar, have earlier denied reports that the former vice-president travelled to the United States.
Paul Ibe and Phrank Shaibu, while reacting to the news, said they were unaware that the PDP presidential candidate travelled out of the country.
You will recall that Atiku was accused of demanding a bribe of $500,000 to facilitate the award of contracts to two American telecommunication firms in Nigeria.
The FBI had searched his residence in the posh neighbourhood of Potomac, Maryland, but no money was found.
The investigators had videotaped Jefferson, who was the congressman representing Louisiana, receiving $100,000 worth of $100 bills which he claimed was meant for Atiku, but the former vice-president has consistently denied the allegation.