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!"

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Rubio gained attention for his 2013 Republican State of the Union response when he desperately grabbed for a water bottle and conspicuously gulped it on air. He poked fun at himself during the most recent GOP presidential debate. But it was after that debate that Trump started commenting that Rubio was sweaty.



"I've never seen a young guy sweat that much. He's drinking water, water, water. I never saw anything like this with him with the water," Trump said while speaking in South Carolina last week.