Former Vice President Joe BidenJoe BidenBiden says his faith is 'bedrock foundation of my life' after Trump claim Biden clarifies comments comparing African American and Latino communities Kanye West may have missed deadline to get on Wisconsin ballot by minutes: report MORE took a phone call with his daughter and ate ice cream during a live interview with late night host Stephen ColbertStephen Tyrone ColbertThe Hill's 12:30 Report - Presented by Facebook - Mnuchin previews GOP coronavirus relief package GOP official says Elizabeth Warren 'endorses voter fraud' after joke about Bailey voting for Biden Bolton book sells 780,000 copies in first week, set to surpass 1M copies printed MORE on Thursday.

The presumptive Democratic presidential nominee also discussed his vice presidential search, how he would distribute a hypothetical COVID-19 vaccination and whether he would call for an investigation of President TrumpDonald John TrumpBiden says his faith is 'bedrock foundation of my life' after Trump claim Coronavirus talks on life support as parties dig in, pass blame Ohio governor tests negative in second coronavirus test MORE if he wins in November.

But his discussion on "The Late Show" was interrupted about 10 minutes in by his cellphone ringing.

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"I'm sorry, I didn't turn off — that's my daughter," Biden said, before answering the call. "Ashley, I'm on Colbert. I got to call you back, baby. I love you."

"I always take my daughter's calls," he explained to Colbert, who told him he understood.

Biden became emotional later in the interview when discussing his late son, Beau, who died of brain cancer in 2015.

"Every morning I get up, I ask myself, 'Is he proud of me? Am I meeting the requirement I promised I would do?'" he said.

The CBS host and the former vice president also ate ice cream together "for charity."

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Colbert ate Ben & Jerry's AmeriCone Dream flavor, which benefits The Stephen Colbert AmeriCone Dream Fund.

"If you're allowed to eat ice cream, I'm going to eat ice cream, too," Biden said, pulling out his own pint of AmeriCone Dream.

Biden also said he's supporting chef José Andrés's work providing meals during the coronavirus pandemic.

Biden, during the 50-minute interview, avoided giving details about his ongoing vice presidential search, although he did reveal that his campaign has nearly finished speaking to people on a "preliminary list" and is moving into the "vetting" phase.

While Sen. Amy KlobucharAmy KlobucharSenate Democrats demand answers on migrant child trafficking during pandemic Senate Democrats push to include free phone calls for incarcerated people in next relief package Lobbying world MORE (D-Minn.) has reportedly been asked to participate in that vetting process, Biden refused to confirm it, merely calling her "first-rate."

"No one's been vetted yet by the team," Biden said. "I'm not going to get into the details of who ... I honest to God don't know who [we'll choose]."

Biden, addressing the ongoing coronavirus pandemic, said as president he would scale up manufacturing ahead of a potential vaccine, work with allies "so we have the access" if it emerges elsewhere and plan ahead for nationwide distribution.

He went on to promise that he would appoint an inspector general to probe where coronavirus stimulus money has gone.

But Biden said if he becomes president, he would never direct the Justice Department to investigate a specific individual in the previous administration.

"The Justice Department is not my lawyer," he said. "This Justice Department has turned into the president's private lawyer. He or she is the people's lawyer."