WASHINGTON — Marco Rubio likes to tweet Bible verses.

Almost every day for the past three months, the Republican senator from Florida slips a pithy message from The Good Book into his Twitter feed for his nearly 3 million followers to digest. A few examples:

Now a Wisconsin-based organization devoted to the separation of church and state is asking him to stop on the grounds that it’s unconstitutional.

“We have no issue with people reading and discussing the bible. The road to atheism is littered with bibles that have been read cover to cover,” Andrew L. Seidel, the Freedom From Religion Foundation's director of strategic response, wrote to Rubio on Tuesday. “But it is not for the government in our secular republic to promote one religious book over others or to promote religion over nonreligion. Doing so violates the Establishment Clause of the Constitution.”

Seidel continued: “By tying your government title to a social media page, you have intimately entwined your official position with the messages you send on that platform, creating the appearance of official endorsement.

The group claims 29,000 members nationwide, including 1,400 in Florida. Seidel wrote that his foundation was “contacted by several concerned citizens, including Floridians” about the tweets.

Rubio’s office did not respond to a request for comment.

But if his Twitter feed is any indication, the senator seems unmoved by the request. He continues to post Bible verses.

“By patience is a ruler persuaded, and a soft tongue can break a bone. Proverbs 25:15,” he tweeted Friday.