U.S. Sen. Pat Roberts is urging people to "let it go" after his cellphone filled a somber committee hearing room with the first few bars of the song from Disney's "Frozen."

The 78-year-old Kansas lawmaker was questioning Agriculture Secretary Tom Vilsack on Thursday when his phone went off.

Vilsack tried in vain to repress a smile as an apologetic Roberts fumbled with his phone and quipped, "Just let it go."

Twitter exploded, with the celebrity news focused TMZ and Roberts' 2014 primary opponent, Milton Wolf, among those offering snarky commentary.

Roberts spokeswoman Sarah Little said in an email that the senator's "Frozen" ringtone is for his grandkids. He has five.