President Donald Trump is weighing whether to fire Kimberly Guilfoyle from her role as U.S. ambassador to Greece following multiple reports alleging improper conduct before and during her tenure.

A person familiar with the matter told CNN on Sunday that Trump has been monitoring the reports and is expected to decide soon. The allegations have drawn the attention of senior administration officials, including Secretary of State Marco Rubio, who visited Athens last week.

The Wall Street Journal reported that Guilfoyle asked Trump donor Eric Deters in text messages to wire $100,000 to pay off an American Express bill days before her Senate confirmation hearing. In exchange, she allegedly offered access to administration officials. Deters did not make the payment. Guilfoyle's lawyer disputed the authenticity of the messages, and she has denied sending them to administration officials.

Earlier Journal reporting described Guilfoyle promoting the interests of Greek construction and energy company Aktor Group during diplomatic events and allowing its lobbyist into private meetings. Additional claims involved acceptance of lavish gifts and services.

A senior U.S. official told the Associated Press that Trump and Rubio are "extremely pissed off" by the reported conduct and likely will decide on action this week after Monday's federal holiday. Rubio was particularly upset because the reports emerged during his Athens visit.

House Democrats have called for investigations and records related to the allegations. The State Department inspector general has opened a probe into claims involving improper gifts, relationships with foreign companies, and other matters.

Trump told reporters on Friday that he had just heard about the reports and called the situation "too bad," adding that Guilfoyle "was always very nice."

Guilfoyle, the former fiancée of Donald Trump Jr., was confirmed as ambassador last year. No departure has been confirmed.