President Donald Trump blasted Republicans Wednesday on Twitter -- tagging Senate Majority Leader Mitch McConnell in a rare move -- for "allowing the Democrats to have ridiculous Post Office hearings on Saturday & Monday, just before and during our Convention" as Democrats revisit questions surrounding the selection process of Trump's controversial postmaster pick. Under mounting concerns with mail-in voting and increased scrutiny in recent weeks for enacting a series of measures meant to streamline the Postal Service, Postmaster General Louis DeJoy has agreed to testify at a GOP-controlled Senate hearing on Friday and a Democratic House hearing on Monday --...