Louisiana Republican Sen. John Kennedy criticized President Donald Trump on Sunday for posting the personal cellphone number of Sen. Tom Cotton (R-Ark.) on Truth Social, saying the president can become hostile in a matter of seconds.

Appearing on NBC’s Meet the Press, Kennedy described Trump as a “friend,” but made clear that he disagreed with the president’s decision to disclose Cotton’s private phone number.

“He exists loudly. He can be tempestuous,” Kennedy said when discussing Trump’s personality.

“I don’t think he should have given out Tom’s cell phone number. I don’t think that’s going to help convince Tom.”

Kennedy then joked with host Kristen Welker, telling her: “And I have your cellphone number, but I promise not to give it out.”

Trump had targeted Cotton over the Arkansas senator’s opposition to legislation known as the Sunshine Protection Act, which would establish daylight saving time as the permanent national time standard.

“To the Great People of Arkansas, please let your Senator know it would be a GREAT Bipartisan WIN for the United States Senate,” Trump wrote. “Call Tom on his cellphone,” he added, before including Cotton’s phone number in the post.

Kennedy appeared to downplay the significance of the disagreement, suggesting that the dispute over daylight saving time was hardly a major national issue.

“Every now and then, there are disputes in Congress that have existential significance for the future of Western civilization,” Kennedy told Welker. “Daylight saving time is not one of them. Tom Cotton feels strongly about it. Tom is a rock star senator. If you get between him and what’s best for Arkansas, he’ll devour you like a light snack.”