U.S. Ambassador to Greece Kimberly Guilfoyle, once a top campaign surrogate for Donald Trump, has resigned amid a misconduct probe.

“Serving as the United States Ambassador to Greece has been the honor of a lifetime,” Guilfoyle said Tuesday in a post on X announcing her resignation.

She also addressed “recent allegations against me,” writing, “These allegations are false, and I intend to vigorously defend my name, my reputation, and my integrity.”

Guilfoyle’s post came shortly after new White House press secretary Katie Zacharia told reporters that Guilfoyle had been asked to step down.