Washington (AFP) – Former US leader Barack Obama launched his sharpest attack to date on President Donald Trump on Thursday, condemning the use of federal agents against protesters and attempts at voter suppression.”Today we witness with our own eyes, police officers kneeling on the necks of black Americans,” Obama said in a fiery eulogy at the emotional funeral service in Atlanta of civil rights leader John Lewis.”We can witness our federal government sending agents to use tear gas and batons against peaceful demonstrators,” the former president said.Obama did not mention Trump by name but he…