Scott Lucas, professor of International Politics at the Clinton Institute, UCD and editor-in-chief of EA WorldView, joins us to examine the history of attacks on US presidents - both sitting and former - to gauge what the fallout from the attempted assassination of Donald Trump could be.The Explainer is brought to you by The Journal. Providing open access to valuable journalism in Ireland has been the aim of The Journal for a decade. You can contribute to ensure we can keep questioning, investigating, debunking, explaining and informing at www.thejournal.ie/contribute/