The US Secret Service has denied diverting resources away from a Donald Trump rally where he was targeted in an assassination attempt.
The former president - who's arrived in Wisconsin for the Republicans' national convention - says it's a 'miracle' he survived.
One man was killed, two other people were seriously hurt during the gun attack.
Meanwhile Joe Biden's urged Americans to 'lower the temperature of politics' during an address from the Oval Office.
The motive for the assassination attempt is still unclear.
21 year old Thomas Matthew Crooks was shot dead within seconds of launching his attack.
Law enforcement is on high alert on the first day of the Republican National Convention in Milwaukee.
The city has been divided into separate access perimeters for the four day event. Michelle lives in Milwaukee and says the atmosphere is quite tense.
Thousands of police officers from across the country have been drafted in to monitor the events.
