Kirk Gibson statrted his pregame press briefing Wednesday with a question. Which two U.S. presidents signed the Declaration of Independence?

The answer: Thomas Jefferson and John Adams.

"Hahaha! That was dirty!" a clearly-in-good-mood Gibson said.

After offering his take on the meaning of Independence Day to him -- "it'll go on forever" -- Gibson said starting pitcher Joe Saunders will have a rehab assignment for his strained left shoulder somewhere soon. Even though Saunders "is not real happy about it," Gibson said.

Saunders threw 51 pitches off a mound Tuesday. He'll throw 80 to 90 pitches in rehab Sunday. Trevor Bauer will start for the Diamondbacks on that day.