It is going to be difficult to reverse the “acidic” political violence in US politics after the assassination attempt on Donald Trump at a campaign rally, a US-European policy expert has told Euronews. Senior fellow at the German Marshall Fund think tank in Washington, Jackson Janes, said although he is unsure whether the attack on the presumptive Republican nominee will meaningfully impact the US presidential election in November, it could yet change the minds of undecided voters. Janes said that the attack is expected to deepen the fervour of Republican voters supporting Trump and will not s…