Member of conseil général des Hauts-de-Seine, he chaired the Committee on Culture, Youth and Sports in 1994, and became chairman of the National Coalition of local elected officials for security.

Since 2006, an investigation is in progress at the brigade suppression of economic crime (OERD) on the electoral roles concerning about 30,000 voters who were sorted by ethnicity for the mayor of Asnières.

[7] This document calls into question several aspects of the management of the town hall of Asnières-sur-Seine, in particular fiscal weaknesses and heavy indebtedness, excessive consumption of fuel for vehicles in city hall, a vehicle assigned to the wife of the Mayor, generous legal fee, claims" the "irregular appointment of a technical executive, managing the construction of a parking lot, and a "conflict of interest" of his deputy in real estate transactions.

[10] The coalition, led by Sébastien Pietrasanta, Josiane Fischer and Christian Leblond finally won the elections in March 2008, with 51.86% of the vote.

The first municipal council of the newly elected team revealed that the report of the CRC which circulated during the campaign without being officially published was indeed the same as the one received by Manuel Aeschlimann in September 2007.

He has put forward legislative proposals on matters including security, and to encourage rehabilitation of property damaged by graffiti,[14] or to strengthen the measures taken against persons guilty of ill – treatment of elderly.

On 13 March 2009, he was found guilty of favoritism in the awarding of a public contract in 1998 whilst in Asnieres, and sentenced in first instance to 18 months in prison, 4 years of ineligibility for political office and 20 000 euro fine.

[16] Manuel Aeschlimann becomes adviser to Nicolas Sarkozy in July 2005 after having established and chaired the committee for monitoring public opinion on the UMP.