Michael Reagan has come out swinging at his brother Ron Reagan, CNN and MSNBC for a controversial TV ad that promotes atheism.

The conservative commentator took to Twitter on Friday to proclaim he was boycotting both cable news networks for running a 30-second spot that features his liberal brother plugging the Freedom from Religion Foundation.

He also said their father, the late Ronald Reagan, was "crying in heaven" over Ron's TV endorsement of the organization whose members do not believe in God.

The ad is appearing on MSNBC's "Morning Joe" and the "Rachel Maddow Show," and on CNN's "CNN Newsroom," "The Lead with Jake Tapper" and "The Situation Room."

In the ad, Ron looks into the camera and explains he is "an unabashed atheist, and I'm alarmed by the intrusion of religion into our secular government.

"That's why I'm asking you to support the Freedom from Religion Foundation, the nation's largest and most effective association of atheists and agnostics, working to keep state and church separate, just like our Founding Fathers intended."

Ron identifies himself as a "lifelong atheist, not afraid of burning in hell."

The ad had previously been refused by CBS, NBC, ABC and Discovery Science.

The Freedom from Religion Foundation describes itself as "the nation's largest association of freethinkers (atheists and agnostics), with more than 27,000 members. It works as a state/church separation watchdog."

This week, the foundation condemned a proposed West Virginia bill to name the Bible as the "official state book," calling it unconstitutional.

And last month, its co-presidents Dan Barker and Annie Laurie Gaylor wrote the Senate Select Committee on Intelligence Energy and Natural Resources to question President Donald Trump's nomination of Dan Coats to be director of national intelligence.

According to the FFRF, "throughout Coats' career, his religion has played an important role. He helped author Don't Ask, Don't Tell, has opposed gay marriage, and has vowed to 'defend the sanctity of life from the moment of conception' all because of his religious beliefs."

Ron has not yet responded to his brother's fiery remarks.

The political beliefs of Michael and Ron have been like night and day for years, with Michael being an unabashed conservative like their father, the late President Ronald Reagan, and Ron being a card-carrying liberal and longtime atheist.

Michael, 71, a Newsmax contributor, is the half-brother of Ron, 58. Michael was adopted as an infant by Ronald Reagan and his first wife, Oscar-winning star Jane Wyman. Ron is the only son of Ronald Reagan and his second wife, actress Nancy Davis.

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Reagan Sons at War Over Atheist TV ad - Newsmax