A senior
"Emergency rule is not compatible with free, fair and credible elections," said John Negroponte, a day after meeting the Pakistani leader.
Gen Musharraf imposed emergency rule two weeks ago following growing opposition and unrest.
He has insisted it can only be lifted once the security situation improves.
Mr Negroponte, the
"Recent political actions against protesters, suppression of the media and the arrests of political and human rights leaders, runs directly counter to reforms that have been undertaken in recent years," he said.
However, the
'Fight against extremism'
On Saturday an aide to Gen Musharraf said he had told Mr Negroponte that the constitution could only be restored when law and order had been re-imposed.
"He told the envoy that the emergency is meant to reinforce and strengthen the law enforcement apparatus in the fight against militancy and extremism," the aide told AFP news agency.
The BBC's Barbara Plett in
He did not signal what kind of pressure might be brought to bear on the Pakistani leader, although American officials said he had raised the issue of cuts in aid to
'Brinkmanship'
Mr Negroponte is the most senior
He also met other high-ranking Pakistani officials and spoke to opposition leader Benazir Bhutto by phone.
Mr Negroponte said he had encouraged Gen Musharraf to resume power-sharing talks with Ms Bhutto.
Those talks broke down as Ms Bhutto threatened to lead mass protests against emergency rule, and was then placed under house arrest. She has now been released, but has appeared to rule out re-starting negotiations.
"If steps were taken by both sides to move back towards the kind of reconciliation discussions they had been having previously, we think that could be very positive," Mr Negroponte said.
Talks could help "pull the political actors back from the atmosphere of brinksmanship and confrontation", he said.
PHOTO CAPTION
John Negroponte