His phone's still ringing (Photographer: Daniel Acker/Bloomberg)

Sen. Lindsey Graham's cellphone is still ringing hours after Donald Trump shared the number on national television. And he's still picking up. But he's not the only one: he's got another senator's kids on phone duty too.

Graham (R-S.C.) was spotted Tuesday night at the movie theaters in Gallery Place in Washington on his way to a viewing of "Minions," an animated film, with Sen. Kelly Ayotte (R-N.H.) and her two young children.

Riding up the escalators to the theaters, Graham took out his cellphone and showed a Washington Post reporter that indeed, the calls are still coming.

"Half of the calls are saying, 'Keep it up,'" he said.

Graham got the ball rolling Tuesday morning when he called Trump a "jackass" during an interview on "CBS This Morning." Hours later, Trump called Graham "stiff" and recounted that the senator had called him a few years ago asking that the businessman name-drop him during one of his regular appearances on Fox News Channel. Then he read out Graham's cellphone number and encouraged the crowd to call -- as his speech aired live on several cable news channels.

Graham later made light of the incident on Twitter, telling his followers that he might need to buy a new phone.

Graham said that on the ride to the theater he took a break from answering the flood of calls, handing the phone to Ayotte's young daughter and son, who would answer and ask, "Who is this?"

"The mailbox is definitely full," Ayotte's son said before they walked into the theater.

After 2016 presidential candidate Sen. Lindsey Graham, (R-S.C.), said fellow GOP candidate Donald Trump should "stop being a jackass," Trump hit back. During a campaign rally in South Carolina, Trump responded by reading Graham's phone number out loud. (C-SPAN)