TRENTON, N.J. - Pharmaceutical giants are mounting a vigorous legal battle against President Biden’s plan to lower seniors’ prescription drug costs, urging federal judges here and around the country to invalidate a new program that aims to reduce the price of medications for high blood pressure, heart disease, cancer and diabetes. In a flurry of lawsuits, these drugmakers have blasted the government initiative as unconstitutional, defended their pricing practices and warned that regulation could