(Reuters) - Below are people mentioned as contenders for senior roles as U.S. President-elect Donald Trump works to form his administration before taking office on Jan. 20, according to Reuters sources and media reports. Trump has already named a number of people for other top jobs in his administration.  Mitt Romney, 2012 Republican presidential nominee and former Massachusetts governor   Rudy Giuliani, Republican former mayor of New York City  Bob Corker, Republican U.S. senator from Tennessee and chairman of the Senate Foreign Relations Committee  David Petraeus, retired general and former CIA director who pleaded guilty to mishandling classified information that he shared with his biographer, who he was having an affair with  Jon Huntsman, former Republican Utah governor and ambassador to China under President Barack Obama, ran for Republican presidential nomination in 2012   James Stavridis, retired Navy admiral  John Bolton, U.S. ambassador to the United Nations under President George W. Bush, foreign policy adviser to 2012 Republican presidential nominee Mitt Romney  Rex Tillerson, president and chief executive officer of Exxon Mobil  Joe Manchin, Democratic U.S. senator for West Virginia   Dana Rohrabacher, Republican U.S. representative of California and senior member of the House Committee on Foreign Affairs  Alan Mulally, a former CEO at Ford  and a former executive vice president at Boeing    Kevin Cramer, Republican U.S. representative from North Dakota  Robert Grady, venture capitalist, partner in private equity firm Gryphon Investors   Heidi Heitkamp, Democratic U.S. senator from North Dakota  Joe Manchin, Democratic U.S. senator from West Virginia  Gary Cohn, president of Goldman Sachs Group Inc  Larry Nichols, co-founder of Devon Energy Corp  James Connaughton, CEO of Nautilus Data Technologies and a former environmental adviser to President George W. Bush  Rick Perry, Republican former Texas governor  Forrest Lucas, founder of oil products company Lucas Oil  Heidi Heitkamp, Democratic U.S. senator from North Dakota  Robert Grady, venture capitalist, partner in Gryphon Investors  Cathy McMorris Rodgers, U.S. representative from Washington state and House Republican Conference chair  Sarah Palin, former Alaska governor and 2008 Republican vice presidential nominee  Jan Brewer, former Republican Arizona governor  Mary Fallin, Republican Oklahoma governor  Ray Washburne, CEO of investment company Charter Holdings  Navy Admiral Mike Rogers, director of the National Security Agency  Ronald Burgess, retired U.S. Army lieutenant general and former Defense Intelligence Agency chief   Robert Cardillo, director of the National Geospatial-Intelligence Agency  Pete Hoekstra, Republican former U.S. representative from Michigan  Rudy Giuliani, Republican former mayor of New York    Debra Wong Yang, former U.S. attorney for California’s Central District, appointed by former President George W. Bush  Ralph Ferrara, a securities attorney at law firm Proskauer Rose LLP  Paul Atkins, a Republican former SEC commissioner who is heading Trump’s transition team for independent financial regulatory agencies, including the SEC  Daniel Gallagher, Republican former SEC commissioner  John Allison, a former CEO of regional bank BB&T Corp and former CEO of the Cato Institute, a libertarian think tank  Paul Atkins, Republican former SEC commissioner   Thomas Hoenig, Federal Deposit Insurance Corp vice chairman   Dan DiMicco, former CEO of steel producer Nucor Corp  Robert Lighthizer, a Washington trade attorney and former deputy U.S. trade representative during the Republican Reagan administration  Andrew Puzder, CEO of CKE Restaurants [APOLOT.UL]   Lou Barletta, Republican U.S. representative from Pennsylvania  Victoria Lipnic, U.S. Equal Employment Opportunity Commission member and former Labor Department official during the George W. Bush administration  Gary Cohn, Goldman Sachs Group Inc president  Mick Mulvaney, Republican U.S. representative from South Carolina  David Malpass, former chief economist with investment bank Bear Stearns and a senior Trump adviser who also served in the Ronald Reagan and George H.W. Bush presidential administrations   Scott Brown, former Republican U.S. senator from Massachusetts  Sarah Palin, former Alaska governor  Jeff Miller, former Republican U.S. representative from Florida who was chairman of the House Veterans Affairs Committee The Trump transition team confirmed the president-elect would choose from a list of 21 names he drew up during his campaign, including Republican U.S. Senator Mike Lee of Utah and William Pryor, a federal judge with the 11th U.S. Circuit Court of Appeals.  