Aides to Mr. McCain said they had a team on the ground in Alaska now to look more thoroughly into Ms. Palin's background. A Republican with ties to the campaign said the team assigned to vet Ms. Palin in Alaska had not arrived there until Thursday, a day before Mr. McCain stunned the political world with his vice-presidential choice.
Although the McCain campaign said that Mr. McCain had known about Bristol Palin’s pregnancy before he asked her mother to join him on the ticket and that he did not consider it disqualifying, top aides were vague on Monday about how and when he had learned of the pregnancy, and from whom.
While there was no sign that her formal nomination this week was in jeopardy, the questions swirling around Ms. Palin on the first day of the Republican National Convention, already disrupted by Hurricane Gustav, brought anxiety to Republicans who worried that Democrats would use the selection of Ms. Palin to question Mr. McCain's judgment and his ability to make crucial decisions.
At the least, Republicans close to the campaign said it was increasingly apparent that Ms. Palin had been selected as Mr. McCain's running mate with more haste than McCain advisers initially described.