The endorsement interrupted a 48-hour assault from an emboldened Mr. Rubio, who is adopting many of the real estate mogul’s crude tactics and colorful insults as he urgently tries to arrest Mr. Trump’s march to the Republican nomination.
In the span of a few hours across Texas, Mr. Rubio suggested that Mr. Trump had urinated in his trousers and used illegal immigrants to tap out his unceasing Twitter messages. Mr. Trump countered by suggesting that Mr. Rubio’s excessive perspiration had no place in the White House and brandishing a water bottle to mock the senator’s chronic thirst.
Waving the bottle across a stage at a Texas rally, pouring half its contents onto the floor and then taking giant gulps from it, Mr. Trump ridiculed his younger rival with exaggerated facial gestures. “It’s Rubio!” he shouted to loud applause and cheers.
