Donald Trump Jnr. hailed his father's fighting spirit in an address to the Republican party faithful in Miwaukee on Wednesday night. The former president Donald Trump was the target of an assasination attempt on Saturday in Butler, Pennsylvania during a rally. "So what was my father's instinct as his life was on the line. Not to cower, not to surrender, but to show for all the world to see that the next American president has the heart of a lion," Trump Jnr. said. He also paid tribute to Corey Comperatore who died in the attack. Comperatore spent the final moments of his life shielding his wife and daughter from gunfire, officials said.