According to a spokeswoman for the senator, Murkowski confirmed to reporters in Washington that she had received a call from Zinke but she said only that he conveyed to her that the president “wasn’t pleased” with the vote that she’d taken, which she already knew from Trump’s tweet.

The goal of the threat was likely twofold: Trump surely wants to send a message to other Republican senators wavering on the party’s still-to-be-announced ultimate health-care proposal, and he wants Murkowski’s vote on final passage of the bill.

But she is an odd choice of a senator to bully for a number of reasons. First, as she pointed out to NBC News on Wednesday, she was reelected just last fall and doesn’t have to run again until 2022. That distinguishes her from Senator Dean Heller of Nevada, another Republican holdout who was subject to Trump’s taunts—and a brief ad campaign by his supporters—after he came out against Majority Leader Mitch McConnell’s first health-care draft. Heller is the most vulnerable Republican up for reelection next year, and under intense pressure from the administration, he voted to open debate on Tuesday.

Murkowski is not only safe for another six years, she has an electoral achievement no other member of the Senate can claim: In 2010, she successfully won reelection to her second term as a write-in candidate after a Tea Party challenger, Joe Miller, defeated her in the Republican primary. Murkowski, whose father served as governor of the state, defeated Miller by just 10,000 votes in the general election that year, but in 2016, she secured the GOP nomination and easily beat back Miller’s third-party bid. Trump did win more votes than her in Alaska last fall, but Murkowski’s political standing in the state appears firm.

Trump also should not have been surprised by Murkowski’s vote on Tuesday. She had been a harsh critic of both the process and the substance of the McConnell bill, worried about its deep Medicaid cuts and impact on Alaska. The administration might have been peeved because it had already steered cash to Murkowski’s state in a revised version of McConnell’s proposal, but even then, she had been clear that it might not be enough to win her support.

According to The New York Times, Murkowski even stood up directly to Trump during a meeting of Republican senators at the White House earlier this month. “With all due respect, Mr. President,” she reportedly told him, “I didn’t come here to represent the Republican Party. I am representing my constituents and the state of Alaska.” After Tuesday’s vote, she called for a bipartisan approach to overhauling health care. “I have repeatedly said that health-care reform, and especially major entitlement reform, should go through the committee process where stakeholders can weigh in and ideas can be vetted in a bipartisan forum,” Murkowski said.