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Mrs. Pelosi has not commented publicly on the Messina email.

In another email released Tuesday, Jeff Smith, a senior adviser to the director of the Office of Science and Technology Policy, offers to meet Jim Kirkland, an executive from the GPS industry, off White House grounds.

LightSquared, a wireless communications company backed by several big Democratic donors, battled the GPS industry for control of frequencies close to the band GPS used.

Republicans, including Rep. Michael R. Turner of Ohio, called for an investigation into whether LightSquared had received preferential treatment from the Federal Communications Commission because one of its investors had given campaign contributions to Mr. Obama.

“Jim — coffee at Caribou Coffee — across the corner from the WH — would work at 11:30 a.m. on Friday … plus getting you through the new WH security rules these days almost takes an act of Congress almost (and you know how well that’s going these days),” Mr. Smith wrote. “[P]lus you’d appear on an official WH Visitor List which is maybe not want you want at this stage.”

A different White House spokesman provided more information about the emails later Wednesday, arguing that Mr. Messina “demonstrated good-faith efforts to comply with the Presidential Records Act.”

But the spokesman did not respond to questions about the practice of White House aides scheduling meetings with lobbyists or others off-site as a way to avoid having the names show up on visitor logs.

“The White House is committed to compliance with the Presidential Records Act,” White House spokesman Eric Schultz told The Washington Times, noting that all emails on the White House email system are archived; access to personal email and social networks from the White House network is blocked; and staff members are instructed to use official accounts for official communications.

Mr. Schultz also suggested that Mr. Messina had a personal relationship with the PhRMA lobbyist that predated his time at the White House and would explain why he used his personal email account to communicate with him.

“Of course, it shouldn’t be surprising that when people have pre-existing professional or personal relationships with White House staff, they may periodically use personal email accounts and receive into them emails they must then preserve for official records,” Mr. Schultz said. “While on the White House staff, Mr. Messina occasionally received and sent email on a long-standing personal account. When some of those emails contained information relating to official communications, he took steps to preserve such emails by forwarding them to his White House email account, or copying his White House email account as a recipient.”

The explanations only led to more questions from Republicans who blasted the White House on the off-campus meetings, as well as the emails Mr. Messina and others sent from personal accounts.

“The self-proclaimed most-transparent administration in history isn’t the most transparent after all,” Reince Priebus, Republican National Committee chairman, said on a conference call with reporters. “Here we go again. … The Obama White House is clearly deceiving the American people and they are deceiving them over a Caribou latte.”

When pressed about what presumptive Republican nominee Mitt Romney would do differently if he wins the White House, Mr. Priebus referred the question to Mr. Romney’s campaign.

Mr. Priebus also was asked how the recent revelations compare with evidence that the Bush White House did similar things.

“I’m not here to re-litigate any of those fights,” he said.