Donald Trump sent a bunch of Trump-branded products to a rival in order to call him sweaty

Real-estate developer Donald Trump took his feud with Sen. Marco Rubio (R-Florida) to a rather unique place this week, sending a gag gift to Rubio's presidential campaign office.

According to CNN, Trump's campaign sent Rubio a "a care package" on Monday containing a 24-pack case of "Trump Ice" bottled water, two "Make America Great Again" towels, and a note that said: "Since you're always sweating, we thought you could use some water. Enjoy!"

Here's a photo of the Trump-branded water:

"A Trump campaign aide said they added the towels 'for him sweating,' and described the overall gesture as a lighthearted prank," CNN's Noah Gray wrote.

Rubio recently started surging in the 2016 presidential race while taking targeted swipes at Trump, the Republican front-runner. Trump has responded with a wide-ranged barrage of attacks, including against Rubio for supposedly sweating too much during the debates.

"I'm looking at guys like Marco Rubio, who has the worst voting record in the United States Senate. And [he's a] young guy - although he sweats more than any young person I've ever seen in my life," Trump said last month. "I've never seen a guy down water like he downs water. They bring it in in buckets for this guy."

During a "New Day" interview Tuesday, CNN's Chris Cuomo told Trump that Rubio's campaign responded to his stunt gift by mocking Trump for losing steam at the end of CNN's lengthy, three-hour debate in September.

"He can send us all of the water he wants. Who was tired in that debate? Thirty-seven minutes [in], Donald Trump wasn't just outplayed in terms of substance, he was tired," Rubio's camp said, according to Cuomo. "He's not in shape for this."

Trump then launched into a series of attacks against Rubio for being a "lightweight," among other things.