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Conservative radio host Rush Limbaugh announced he is battling "advanced" lung cancer. The talk radio icon shared the shocking news on his syndicated show on Monday.

"I have to tell you something today that I wish I didn't have to tell you," the 69-year-old cigar smoker said, according to The Hill. "It's a struggle for me, because I had to inform my staff earlier today. I can't help but feel that I'm letting everybody down... The upshot is that I have been diagnosed with advanced lung cancer."

Limbaugh, who is widely viewed as one of President Donald Trump's most influential media allies, will be seeking treatment this week, but he hopes to return to work on Thursday.

Ending his broadcast, Limbaugh revealed that his 31-year run as the host of his popular radio show has brought him "greatness, satisfaction and happiness", adding, "Every day I'm not here, I'll be missing you (listeners) and thinking about you."

Limbaugh signed a contract extension with Premiere Networks last month, ahead of his diagnosis.