Kimberly Guilfoyle resigns as U.S. Ambassador to Greece

(NBC, KYMA) - U.S. Ambassador to Greece Kimberly Guilfoyle, once a top campaign surrogate for President Donald Trump, has resigned Tuesday amid a misconduct probe.

"Serving as the United States Ambassador to Greece has been the honor of a lifetime," Guilfoyle said 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 Guilfoyle had been asked to step down.

Guilfoyle, the former fiancée of Donald Trump Jr., has been under investigation by the State Department's Inspector General's Office, two people familiar with the decision confirmed to NBC News last week.

The probe came after the Wall Street Journal reported allegations of misconduct in her role as ambassador, including allegations that she bragged about her connections to Greek tycoons who she said funded luxury trips for her.

The article cited people who heard the conversation and an audio recording, but NBC News has not independently confirmed the allegations.

A Trump donor named Eric Deters came forward this month, accusing her of asking him to pay her outstanding $100,000 American Express bill in the days before her 2025 Senate confirmation hearing in exchange for access to senior administration officials.

Lawmakers previously expressed concerns over allegations that Guilfoyle may have threatened to use U.S. influence to undermine the Greek government.

Greece has been an important NATO ally to the U.S., offering key military facilities to safeguard security in the eastern Mediterranean, and it leads an E.U. maritime mission to protect commercial shipping in the Red Sea.