Sen. John Kerry (D-Mass.) will be nominated to succeed Hillary Clinton as Secretary of State, sources tell ABC's Jake Tapper.

The announcement will not come in the next few days, ABC reports, due to a number of circumstances.

Kerry topped President Barack Obama's short list of candidates after U.N. Ambassador Susan Rice withdrew her name from consideration in light of fierce GOP opposition.

The Huffington Post's Sam Stein and Joshua Hersh reported earlier this month that Democrats were nervous about the prospect of nominating Kerry:

The concerns have nothing to do with Kerry's ability to handle the Foggy Bottom post. Nearly everyone agrees that he has the intellectual acumen and experience for the job.

Instead, Democrats said they worry that Republicans may be using the secretary of state fight as a roundabout way to regain a Senate seat the GOP lost this fall, when Sen. Scott Brown (R-Mass.) was defeated by Elizabeth Warren. The anti-Rice gambit, some Democrats said, has the feel of a Republican long con.

"I don’t doubt that at all in terms of their motives," said Tad Devine, a longtime Democratic strategist who served as a senior adviser to Kerry's 2004 presidential campaign. "I think they are trying to come down from 55 [Democrats] to get to 50 as fast as they can in the Senate."

In back channels, these concerns are making their way to the top levels of the administration. Top Senate Democrats have expressed concerns to the White House about a possible special election for a Senate seat in Massachusetts, a Democratic source close to conversation told The Huffington Post. Another Democratic source -- who, like the first, would only discuss sensitive conversations on condition of anonymity -- confirmed that concerns were expressed. A third source added that leaders in the Senate also said they would be comfortable with a prospective Kerry nomination if it is clear that the White House is invested in a subsequent special election.

Click here for ABC's full story.

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• Hillary Clinton (2009-present)

  U.S. Secretary of State Hillary Clinton speaks at a press conference on November 14, 2012. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Condoleezza Rice (2005-09)

  Secretary of State Condoleezza Rice talks about the State Department's 2007 Country Reports on Human Rights Practices during a March 11, 2008 briefing in Washington. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Colin Powell (2001-05)

  U.S. Secretary of State Colin Powell speaks on June 22, 2004, about a corrected version of an inaccurate terrorism report issued by the government. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Madeleine Albright (1997-2001)

  U.S. Secretary of State Madeleine Albright delivers a Russia policy briefing on September 16, 1999 in Washington. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Warren Christopher (1993-97)

  U.S. Secretary of State Warren Christopher briefs reporters on the peace process in Bosnia during a Dec. 8, 1995 press conference. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Lawrence Eagleburger (1992-93)

  Then-acting Secretary of State Lawrence Eagleburger listens to a reporter's question during a Nov. 18, 1992 news conference at the State Department. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• James Baker (1989-92)

  James Baker III waves to his associates at the US State Department on August 13, 1992. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• George P. Shultz (1982-89)

  U.S. Secretary of State George Shultz listens to a question during his first day of testimony before Iran-Contra investigators on July 23, 1987 in Washington. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Alexander Haig (1981-82)

  Alexander Haig, Secretary of State-designate, a Reagan nominee on Monday, Dec. 23, 1980 in Washington for the announcement of selections. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Edmund Muskie (1980-81)

  (Pictured left) Freed hostage Richard Queen, right, greets well wishers at the State Department on Monday, July 21, 1980 in Washington. At left is Secretary of State Edmund Muskie. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Cyrus Vance (1977-80)

  Cyrus Vance, U.S. Secretary of State, pictured in 1979. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Henry Kissinger (1973-77)

  Secretary of State Henry Kissinger announces during an April 29, 1975 press conference in Washington that the evacuation of Americans from Vietnam and Saigon is complete, thus ending US involvement. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• William P. Rogers (1969-73)

  Israeli Defense Minister Moshe Dayan, left, and Secretary of State William P. Rogers begin talks at the Department of State on Feb. 7, 1972 in Washington. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Dean Rusk (1961-69)

  Secretary of State Dean Rusk is shown during a news conference in Washington, D.C., on March 1, 1962. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Christian Herter (1959-61)

  President Dwight Eisenhower, left, says goodbye to Secretary of State Christian Herter in Gettsburg, Pennsylvania, on May 2, 1959 as Herter is about to board a helicopter on the President's farm to return to Washington. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• John Foster Dulles (1953-59)

  U.S. Secretary of State John Foster Dulles (left) gets together with South Korean President Syngman Rhee in Seoul on August 4, 1953. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Dean Acheson (1949-53)

  U.S. Secretary of State Dean Acheson speaks from the State Department on Nov. 29, 1950 in Washington. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• George C. Marshall (1947-49)

  Gen. George C. Marshall poses in his Red Cross office on Sept. 13, 1950 in Washington. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• James F. Byrnes (1945-47)

  James F. Byrnes, United States Secretary of State, links arms with Associated Press correspondent, John Hightower, at Central Hall, Westminster in London, Jan. 15, 1946. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Edward Reilly Stettinus (1944-45)

  France's Foreign Minister Georges Bidault makes a VE Day radio statement from the Opera House in San Francisco, CA, May 8, 1945. Seated at the far right U.S. Secretary of State Edward Stettinius. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Cordell Hull (1933-44)

  U.S. President Franklin Roosevelt is greeted by Secretary of State Cordell Hull on Sept. 15, 1938 in Washington. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Henry Lewis Stimson (1929-33)

  Henry Lewis Stimson, American Secretary of State for War shown around July 1931. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Frank B. Kellogg (1925-29)

  Former United States Secretary of State Frank B. Kellogg on Aug. 17, 1936 at Waterloo Station in London. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)

• Charles Evans Hughes (1921-25)

  (Center) Former Secretary of State and Chief justice Charles Evans Hughes, pictured on on March 27, 1931. (Source: <a href="http://www.state.gov/secretary/former/">U.S. Department Of State</a>)