“The View” co-host Meghan McCain Meghan Marguerite McCainKasich to Meghan McCain: Concern over abortion 'dwarfed' by need to beat Trump Meghan McCain says she believes report Trump called fallen soldiers 'losers' Meghan McCain hits Ivanka Trump's defense of president's Twitter: It's not a 'communication style,' it's 'cruelty' MORE swiped at Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) after a heated exchange between the senator and former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE on bankruptcy rates due to cancer in Thursday evening’s third Democratic presidential debate.

Sanders, arguing the need for universal health care, listed rates of bankruptcy for diseases such as cancer, saying under Biden's health care plan, families could be hit with massive costs.

“I know about cancer,” the former vice president responded.

“Don't you dare lecture Biden about cancer, Bernie...” McCain tweeted.

Don't you dare lecture Biden about cancer, Bernie... #DemDebate — Meghan McCain (@MeghanMcCain) September 13, 2019

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Biden’s son Beau died of brain cancer in 2015, and Biden has frequently spoken of losing him, the namesake of the Beau Biden Cancer Moonshot, a $1.8 billion investment in cancer research as part of the 21st Century Cures Act.

Biden and McCain, whose father, the late Sen. John McCain John Sidney McCainCrenshaw looms large as Democrats look to flip Texas House seat Analysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture MORE (R-Ariz.), died of cancer in 2018, have bonded over their shared history with the illness before. In a 2017 appearance on the program, McCain was moved to tears as he offered advice on her father’s then-recent diagnosis, while in an April 2019 appearance they again discussed the topic.

"There will come a time when you walk by that closet or smell that fragrance or sit out on the porch at that ranch," Biden told McCain. “You’re gonna get a smile before you get a tear, and that's when you’ll know you’re gonna make it."