US federal agents have searched the Manhattan home and office of Rudy Giuliani, former President Donald Trump’s attorney, a law enforcement official says. The raid marks an escalation of the investigation into the Ukrainian business dealings of Mr Giuliani. Mr Giuliani’s lawyer, Bob Costello, confirmed search warrants had been executed, and that authorities had seized mobile phones. Mr Giuliani, 76, did not immediately respond to a request for comment as members of the media assembled outside his apartment. The warrants included an allegation that Mr Giuliani failed to register as a foreign agent, a violation of lobbying laws.