WASHINGTON : President Donald Trump on Sunday declared he was healthy enough to return to the campaign trail, a day after the White House doctor said he was no longer at risk of transmitting the coronavirus but did not say explicitly whether Trump had tested negative for it.Trump, who was poised Monday to host his first rally after his COVID-19 diagnosis, declared he was now “immune" from the virus, a claim that was impossible to prove and comes amid a series of outstanding questions about the president's health.“I’m immune," Trump said in an interview on Fox News. “The president is in very good shape to fight the battles."In a memo released Saturday night by the White House, Navy Cmdr.