PHILADELPHIA — Republican John McCain said Tuesday he's satisfied that Sarah Palin's background was properly checked out before the Alaska governor joined the Republican ticket.

"The vetting process was completely thorough and I'm grateful for the results," McCain told reporters as he toured a Philadelphia fire house.

Questions about the review came up after news surfaced that Palin's unmarried teenage daughter, Bristol, is pregnant, and that the Alaska governor has retained a private attorney to represent her in an investigation into the firing of the state public safety commissioner.

The lawyer who conducted the background review said Palin voluntarily told McCain's campaign about Bristol's' pregnancy, and about her husband's 2-decade-old DUI arrest during questioning as part of the vice presidential search process.

The Alaska governor also greatly detailed the dismissal of the state's public safety commissioner that has touched off a legislative investigation, Arthur B. Culvahouse Jr. told The Associated Press in an interview Monday.

Palin underwent a "full and complete" background examination before McCain chose her as his running mate, Culvahouse said. Asked whether everything that came up as a possible red flag during the review already has been made public, he said: "I think so. Yeah, I think so. Correct."

McCain's campaign has been trying to tamp down questions about whether the Arizona senator's team adequately researched his surprise vice presidential selection.

Since McCain publicly disclosed his running mate on Friday, the notion of a shoddy, rushed review has been stoked repeatedly.

First, a campaign-issued timeline said McCain initially met Palin in February, then held one phone conversation with her last week before inviting her to Arizona, where he met with her a second time and offered her the job Thursday.

Then came the campaign's disclosure that 17-year-old Bristol Palin is pregnant. The father is Levi Johnston, who has been a hockey player at Bristol's high school, The New York Post and The New York Daily News reported in their Tuesday editions.

In addition, the campaign also disclosed that Palin's husband, Todd, then age 22, was arrested in 1986 in Alaska for driving under the influence of alcohol.

Shortly after Palin was named to the ticket, McCain's campaign dispatched a team of a dozen communications operatives and lawyers to Alaska. That fueled speculation that a comprehensive examination of Palin's record and past was incomplete and being done only after she was placed on the ticket.