President Donald Trump said on Thursday he was blocking Democrats’ effort to include funds for the U.S. Postal Service and election infrastructure in a new coronavirus relief bill, a bid to block more Americans from voting by mail during the pandemic. Congressional Democrats accused Republican Trump of trying to damage the struggling Postal Service to improve his chances of being re-elected as opinion polls show him trailing presumptive Democratic nominee Joe Biden. Trump has been railing against mail-in ballots for months as a possible source of fraud, although millions of Americans - including much of the military - have cast absentee ballots by mail for years without such problems.