The White House on Tuesday escalated its feud with Sen. Bob Corker, sending an unmistakable signal to other Republicans that public criticism of President Trump will be met with a fierce public scolding.

White House press secretary Sarah Huckabee Sanders used her news briefing to tear into Corker, saying he had “rolled out the red carpet” for the Iran nuclear deal. She also voiced ambivalence about calls from Trump allies for the Tennessee Republican to resign.

The barbs followed a fresh Twitter blast from Trump, in which the president gave the 5-foot-7-inch Corker a new disparaging nickname, “‘Liddle’ Bob,” and said he had been made to look like a “fool” in an interview.

While many Senate Republicans were hoping to move on from the dispute, which began over the weekend, the White House appeared interested in underlining the consequences for any Republican who crosses Trump.