DeMint gave colleagues short notice

Republican senators were shocked to hear Thursday morning that Sen. Jim DeMint (R-S.C.), a prominent Senate conservative, would retire at the end of the year.

DeMint said he would leave the Senate to take over as president of The Heritage Foundation in January, four years before his second Senate term is due to expire in 2016.

DeMint informed his staff of the decision Thursday morning and it caught many of them completely by surprise.

He called Senate Republican Leader Mitch McConnellMitch McConnellRyan fans GOP civil war over Donald Trump Third-party push gaining steam Missouri Republican: Trump has not earned my vote MORE (Ky.) at 9 a.m. with the news, about an hour before The Wall Street Journal broke the story to the public.

DeMint also gave a heads up to his colleague from South Carolina, Sen. Lindsey Graham (R-S.C.), who later said he was so surprised, “I about fell off of my couch.”

“Everybody was really surprised,” said Sen. Susan CollinsSusan CollinsStoddard: Can Trump close the deal with the GOP? The Trail 2016: And then there was one Maine Republican senator suggests she could back Trump MORE (R-Maine).

DeMint announced his retirement to the editorial page of The Wall Journal’s editorial page. Daniel Henninger, the deputy editor of the editorial page, posted a story about it shortly after 10 a.m.

After DeMint spoke to his Senate staff, he crossed Massachusetts Avenue NW to meet with the staff of The Heritage Foundation, according to a source familiar with his day.

He and outgoing Heritage president Ed Feulner then did a radio interview with conservative talk show host Rush Limbaugh.

“I believe that I can do more good for the conservative movement outside of the Senate in leveraging the assets of The Heritage Foundation to communicate a more positive, optimistic message to the American people,” DeMint told the host.

Reporters caught DeMint after his talk at Heritage, but he spoke to them only briefly.

At noon, Senate Democratic Leader Harry ReidHarry ReidThe Trail 2016: GOP stages of grief Dems slam Trump over taco bowl tweet Reid: GOP is the party of Trump MORE (D-Nev.) told reporters that DeMint had personally informed him of his plans to retire early.

“Sen. DeMint came and talked to me just a short time ago, to tell me what he was going to do. I've read his book. He's read my book. We're friends,” Reid said.

“We spent a half hour within the past week talking about the Senate. At that time, I didn't know that he was considering leaving. I'm not sure that he'd made the decision at that time. I rather doubt it. But I've always liked the guy,” Reid said.

“And, even though I disagree with so much of what he's done, I appreciate — I personally believe he does this out of a sense of real belief, it's not political posturing for him, as it is for a lot of people,” he added.

DeMint had confirmed the story to Limbaugh.

"This may surprise you, but Harry Reid's a good friend of mine. I just walked into his office and talked to him," DeMint said.

"The problem is not Harry Reid. I think the problem is, as conservatives, we have not taken enough control of our message and our ideas and communicated them directly to the American people," he said.

DeMint voted for legislation to normalize trade relations with Russia and against a judicial nomination for the northern district of Florida before slipping into a Republican lunch in the Senate’s Lyndon Baines Johnson Room shortly after noon.

He dined at the same table as Sens. Bob Coker (R-Tenn.), Mike CrapoMike CrapoHousing groups argue Freddie Mac's loss should spur finance reform Bipartisan effort seeks end to budget gimmicks Republicans mum on possibility of Trump filling Supreme Court seat MORE (R-Idaho), Ron JohnsonRon JohnsonThe Trail 2016: GOP stages of grief The Hill's 12:30 Report The Trail 2016: And then there was one MORE (R-Wis.) and retiring Sen. Dick Lugar (R), who lost the Senate Republican primary in Indiana to Richard Mourdock, a candidate DeMint backed in the general election.

He slipped out of the lunchroom through a back door, avoiding reporters who had assembled outside the Senate chamber until well past 2 p.m. to interview him.