Joe Biden comforts Meghan McCain over father's cancer diagnosis in tear-jerking moment

Joe Biden is no stranger to the McCain family's current struggle.

The former vice president lost his beloved son, Beau, in May 2015 after a hard-fought battle with brain cancer.

In July 2017, Senator John McCain of Arizona was diagnosed with glioblastoma, the same aggressive form of brain cancer that claimed Beau Biden's life just two years earlier.

On Wednesday morning, Biden appeared on "The View" to promote his new memoir, "Promise Me, Dad," which focuses on Biden's career in the year that followed Beau's death.

During the show, co-host Meghan McCain, daughter of John McCain, admitted that she struggled to finish Biden's book because it hit too close to home.

"I couldn’t get through your book, I tried. Your son Beau had the same cancer that my father was diagnosed with six months ago," McCain said while choking up. "I think about Beau almost every day, and I was told that this doesn’t get easier."

SEE: The McCain family through the years:

Abandoning his seat across the table, Biden got up and sat down next to a teary-eyed McCain and took her by the hand to share some words of comfort about her father, who developed a friendship with Beau during his lifetime.

"One of the things that gave Beau courage, my word, was John," Biden said. "Your dad, you may remember when you were a little kid, took care of my Beau. Your dad became friends with Beau, and Beau talked about your dad's courage. Not about illness, but about his courage."

The former vice president went on to try to encourage McCain to maintain a positive outlook, noting multiple recent breakthroughs in the cancer research field.

"Any of you who have somebody who is diagnosed with glioblastoma, which is about as bad as it gets, there are breakthroughs that are occurring now," he said. "It can happen tomorrow."

Biden, who has been friends with McCain for 40 years, offered some parting words of encouragement for anyone fighting the same battle as the senator and his family.

"The thing that I found, and Beau insisted on and your dad is going to insist on, is you’ve got to maintain hope," Biden said. "You have to have hope."

"There is hope," he continued. "And if anybody can make it, your dad [can]."

Watch the touching moment below: