When the 78-year-old Kansas senator was questioning Secretary of Agriculture Tom Vilsack, his phone began to ring, playing Robert Lopez and Kristen Anderson-Lopez's Oscar-winning song "Let It Go," performed by Tony Award winner Idina Menzel in "Frozen."
"Aw, come on," Roberts said when his phone went off. When the crowd started laughing, he replied, "Let it go."
Watch the video below: