KAREN FREIFELD A grand jury is hearing evidence in New York over former President Donald Trump's role in hush money payments to porn star Stormy Daniels during his 2016 presidential campaign, two sources with knowledge of the matter told Reuters. A grand jury could lay the groundwork for possible criminal charges against the former president by the Manhattan district attorney's office. Former National Enquirer publisher David Pecker testified before the grand jury, one source told Reuters. Pecker was seen entering the lower Manhattan building where the grand jury is empaneled, according to the New York Times, which first reported on…