The top Republican on the House Oversight and Government Reform Committee is calling on the White House to make public all taxpayer-funded travel by administration officials on behalf of Democratic candidates and fully disclose any possible efforts to manipulate elections.

Rep. Darrell Issa, R-Calif., fired off a letter Thursday to 21 Cabinet secretaries and department heads -- including Secretary of State Hillary Clinton -- requesting the political office disclose travel costs for campaign-related trips by White House officials.

In his letter, Issa cited a 2008 report by House oversight committee chairman Rep. Henry Waxman, D-Calif., on the Bush administration's aggressive use of the political office for campaign travel...