“After vowing to have a positive convention, the president goes negative in its first moments," said Cooper. "He started off falsely attacking mail-in voting. He’s continuing to attack mail-in voting as his postmaster general testifies that the attacks are ‘unhelpful.’ That’s his own postmaster general. He also criticized the media for airing the postmaster’s hearing instead of his roll call.” CBS News also cut away for a live fact-check. Meanwhile, Trump blasted CNN and MSNBC for lack of coverage of the Republican National Convention roll call. Unlike the Democratic convention, the Republicans held their roll call away from primetime.