Carrie Underwood performed at Donald Trump 's presidential inauguration in Washington, D.C., on Monday, January 20 — but it didn't go down without a snag.

You know the words ― help me out here,” Underwood said after a crew member alerted her of the audio malfunction. She then launched into the song a cappella as many attendee

In an exclusive interview with Fox News Digital, Lee Greenwood came to Carrie Underwood's defense after some criticized the country star for agreeing to perform at the presidential inauguration on Jan.