Story highlights Trump's campaign sent a care package to Rubio's Washington office

The package included a case of water, "Make America Great Again" towels, and a note

Atlanta (CNN) Donald Trump is escalating his attacks on Sen. Marco Rubio with a special delivery for his rival: "Trump Ice Natural Spring Water."

Trump has previously trained his fire on Rubio, claiming he has the worst voting attendance record in the U.S. Senate and that he sweats a lot. But CNN learned that the Trump campaign sent a "care package" to Rubio's Washington campaign office that contained a 24-bottle case of "Trump Ice Natural Spring Water," with Trump's face on it, two "Make America Great Again" towels and bumper stickers and a note reading, "Since you're always sweating, we thought you could use some water. Enjoy!"

A Trump campaign aide said they added the towels "for him sweating," and described the overall gesture as a lighthearted prank.

The package was delivered on Monday. The Rubio campaign didn't respond to a request for comment.

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