The following 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.

ENERGY SECRETARY

* Rick Perry, Republican former Texas governor, is expected to be named as nominee by Trump. * 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 * Larry Nichols, co-founder of Devon Energy Corp * James Connaughton, chief executive officer of Nautilus Data Technologies and a former environmental adviser to President George W. Bush

DIRECTOR OF NATIONAL INTELLIGENCE

* 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

U.S. SECURITIES AND EXCHANGE COMMISSION

* Debra Wong Yang, a former U.S. attorney who was appointed by former President George W. Bush * Ralph Ferrara, a securities attorney at Proskauer Rose LLP * Paul Atkins, a former SEC commissioner who heads Trump's transition team for independent financial regulatory agencies * Daniel Gallagher, Republican former SEC commissioner

FEDERAL RESERVE VICE CHAIRMAN FOR BANK OVERSIGHT

* John Allison, a former CEO of regional bank BB&T Corp and former head of the Cato Institute, a libertarian think tank * Paul Atkins, former SEC commissioner * Thomas Hoenig, Federal Deposit Insurance Corp vice chairman and former head of the Kansas City Federal Reserve Bank U.S.

TRADE REPRESENTATIVE

* Dan DiMicco, former CEO of steel producer Nucor Corp * Robert Lighthizer, former deputy U.S. trade representative during the Reagan administration

WHITE HOUSE OFFICE OF MANAGEMENT AND BUDGET

* Mick Mulvaney, Republican U.S. representative from South Carolina * David Malpass, former chief economist with investment bank Bear Stearns and a senior Trump adviser

SECRETARY OF AGRICULTURE

* Chuck Conner, a former acting secretary of the U.S. Agriculture Department and current head of the National Council of Farmer Cooperatives * Tim Huelskamp, Republican U.S. representative from Kansas * Sid Miller, Texas agriculture commissioner * Sonny Perdue, former Georgia governor

VETERANS ADMINISTRATION

* 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

FOOD AND DRUG ADMINISTRATION

* Dr. Scott Gottlieb, a venture capitalist, resident fellow at the American Enterprise Institute and former Food and Drug Administration deputy commissioner * Jim O'Neill, a Silicon Valley investor who previously served in the Department of Health and Human Services

SUPREME COURT VACANCY

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.