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Iran's parliament revealed it planned to impeach President Mahmoud Ahmadinejad but refrained under orders from Supreme Leader Ayatollah Ali Khamenei, exposing a deepening division within the regime.

Lawmakers also launched a new petition to bring a debate on the president's impeachment, conservative newspapers reported Monday.

The reports of challenges to Mr. Ahmadinejad were intended as retorts to a powerful body of clerics that urged Mr. Khamenei to curb the parliament's authority and give greater clout to the president.

In a report released Sunday and discussed in parliament Monday, four prominent lawmakers laid out the most extensive public criticism of Mr. Ahmadinejad to date.