“He does not agree with Senator Corker,” Barrasso spokeswoman Bronwyn Lance Chester said in a written statement. “Senator Barrasso has worked closely with President Trump and will continue to be a strong ally in Congress.” Barrasso, a member of the Republican leadership, could face a primary challenge next year from a candidate backed by Trump’s former chief strategist, Steve Bannon.

Aside from Wyoming, every other Republican senator refused to take sides.

“Senator Corker and the president obviously have differences they need to resolve, but Senator Risch has no intention of getting involved in this matter,” said Kaylin Minton, a spokeswoman for Jim Risch of Idaho. Risch is the second-ranking Republican on the Foreign Relations Committee and is all but certain to succeed Corker as its chairman if the GOP retains control of the Senate in 2019. Corker chose to retire rather than run for a third term next year, a decision that’s at the heart of his feud with Trump. A former Trump rival, Senator Ted Cruz, similarly sidestepped the fray at an appearance Tuesday in Texas. “I am not going to get into the personality battles of Washington,” he said, according to a quote passed along by his spokesman.

Senators Rob Portman of Ohio and Lamar Alexander of Tennessee each offered statements of praise for Corker without mentioning Trump. “Bob Corker has been a leader in Congress on issues as diverse as deficit reduction and combatting terrorism, and he is a man of unwavering integrity,” Portman said. “If we’re going to accomplish our economic and national security agenda, we’re going to have to work together, period.”

Alexander, who is Tennessee’s senior senator, said: “I work with Bob Corker nearly every day. He is a terrific United States senator, and I’m disappointed he’s decided not to seek reelection.”

That was the tack adopted by Senate Majority Leader Mitch McConnell, another favorite GOP target of Trump’s ire. At an appearance in Kentucky, McConnell called Corker “a valuable member of the Senate Republican caucus,” the Associated Press reported. He also alluded to a potential pitfall of Trump’s decision to go after Corker—the Tennessean’s seat on the Budget Committee. That panel just approved a budget resolution necessary to accomplish the party’s goal of tax reform, and Corker’s support for both the budget and the eventual tax legislation will be crucial to the GOP’s chances of success in the closely-divided Senate.

The Republican senators keeping quiet included those who have most frequently criticized the president: John McCain and Jeff Flake of Arizona, and Ben Sasse of Nebraska. If Senator Lindsey Graham of South Carolina had an opinion on Trump’s fight with Corker, he delivered it to the president himself: The two played golf on Monday, and Graham told MSNBC that he urged Trump to back off the feud. “I don’t think it helps any of us to continue this,” he said.