He gave him a list of 'no-go areas' that might arise, like Afghanistan. He said that concerning the Geneva talks, Manhattan should reply that they can't resume until the Soviets agree to exclude him from the agenda.
However, it was not what Manhattan was there for. After Doug Roth's allegations that Manhattan causes cancer to humans, a fray erupted and the journalists came towards him asking for details concerning his relationship to Janey Slater. Forbes attempted to guide Manhattan outside and hold off the journalists. Eventually Manhattan teleported everyone away.
He then visited Rockefeller Military Research Center and interrogated Laurie about whether he had put him in emotional stress.
In the film he is portrayed by Fulvio Cecere. In the director's cut DVD his role is somewhat expanded, as his interrogations make Laurie angry. She later beats and ties him with handcuffs in order to escape.