Maxine Waters has slammed Donald Trump as a "99% liar" for saying that 99% of Covid-19 cases are harmless. “We have tested over 40 million people. By so doing, we show cases, 99 percent of which are totally harmless. Results that no other country will show, because no other country has testing that we have — not in terms of the numbers or in terms of the quality," Donald Trump remarked at the White House on July 4. Trump's aides had trouble …