Donald Trump Jr. hailed his father’s fighting spirit in an address to the Republican party faithful in Milwaukee on Wednesday night.

The former president Donald Trump was the target of an assassination 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 Jr. 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.