Federal agents raided Rudy Giuliani’s Manhattan home and office Wednesday, seizing computers and cellphones in a major escalation of the Justice department’s investigation into the business dealings of former president Donald Trump’s personal lawyer. Giuliani, the 76-year-old former New York City mayor once celebrated for his leadership after 9/11, has been under federal scrutiny for several years over his ties to Ukraine. The dual searches sent the strongest signal yet that he could eventually face federal charges.