The magazine has been critical of Trump but Thursday took on a bolder stand against the president.
"Look at all the President has accomplished in a very short time", Graham pleads, pointing to the economy, the defeat of "ISIS & the caliphate", and "renegotiated trade deals to benefit all Americans".
The editor in chief went on to note Christianity Today's condemnation of President Clinton's behavior amid his impeachment, and wrote, "Unfortunately, the words that we applied to Mr. Clinton 20 years ago apply nearly perfectly to our current president".
The subhead in Christianity Today is revealing: "It's time to say what we said 20 years ago when a president's character was revealed for what it was".
The magazine, Trump said, would rather have a "radical left nonbeliever, who wants to take your religion and your guns, than Donald Trump as your president".
"And President Trump has been defending Christians. His Twitter feed alone - with its habitual string of mischaracterizations, lies, and slanders - is a near ideal example of a human being who is morally lost and confused". You'll not get anything from those Dems on stage. "The President's failure to tell the truth-even when cornered-rips at the fabric of the nation".
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Graham wrote, "Christianity Today released an editorial stating that President Trump should be removed from office-and they invoked my father's name (I suppose to try to bring legitimacy to their statements), so I feel it is important for me to respond". "Consider how your justification of Mr. Trump influences your witness to your Lord and Saviour".
Trump has enjoyed steady support from evangelicals during his presidency. Whether Mr. Trump should be removed from office by the Senate or by popular vote next election - that is a matter of prudential judgment.
Evangelical Christians make up about 25 per cent of USA voters, according to Pew Research, and have been a bedrock of Trump's support.
The House of Representatives in a near party-line vote impeached Trump on charges of abuse of power and obstructing Congress. "We wrote editorials about Clinton during his impeachment process, we wrote editorials about Nixon during his...this struck me as rising to that level and it needed comment". "I won't be reading ET again!"
The editorial came as an unexpected move from the magazine, founded by Billy Graham in 1956. "He believed Donald J. Trump was the man for this hour in history for our nation", Graham tweeted.
"Unfortunately, the words that we applied to Mr. Clinton 20 years ago apply nearly perfectly to our current president", the editorial stated.
"The fact of the matter is Christianity Today is not read by the people - Christians on the far right, by evangelicals on the far right - so they're going to be as dismissive of the magazine as President Trump has shown to be".
No president has ever been removed from office via impeachment.