The attempted bomb attacks against former US President Barack Obama, Hillary Clinton, CNN and others were front-and-centre at the preshow of President Donald Trump's Wednesday night Wisconsin rally. In his speech, he said, “I want to begin tonight's rally by addressing the suspicious devices and packages, that were mailed to current and former high ranking government officials. My highest duty, as you know, as president is to keep America safe. That's what we talk about, that's what we do. The federal government is conducting an aggressive investigation and we will find those responsible and we will bring them to justice, hopefully very quickly.”