(CNN) - Mitt Romney's presidential campaign has added two additional staffers to its upper ranks, a senior campaign aide confirmed to CNN on Friday.
Danny Diaz and Kevin Sheridan have joined the campaign as senior advisers.
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Diaz was formerly communications director for the Republican National Committee and is a founding partner at the firm FP1 Strategies.
In the 2008 election cycle, he was deputy communications director for John McCain's presidential campaign.
Sheridan is a senior vice president at the Edelman public relations firm.
He was press director for the U.S. Agency for International Development under the administration of President George W. Bush, and through 2004 was a spokesman and director of regional media for the RNC.
Romney's campaign has added staff as it transitions from the GOP primaries to general election mode.
His staff has also come under criticism this month from prominent Republicans Rupert Murdoch, chairman of News Corporation, and former General Electric Chairman and CEO Jack Welch.
Murdoch tweeted, "Tough O[bama] Chicago pros will be hard to beat unless he drops old friends from team and hires some real pros. Doubtful."
– CNN Political Director Mark Preston contributed to this report