TEHRAN, March 14 — Just weeks ago, the Iranian government's combative approach toward building a nuclear program produced rare public displays of unity here. Now, while the top leaders remain resolute in their course, cracks are opening both inside and outside the circles of power over the issue.

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Mehr News Agency, via Associated Press

President Mahmoud Ahmadinejad toured northern Iran Tuesday.

Forum: The Middle East

Some people in powerful positions have begun to insist that the confrontational tactics of President Mahmoud Ahmadinejad have been backfiring, making it harder instead of easier for Iran to develop a nuclear program.

This week, the