On 6 October 1848 during the debate on the Constitution he insisted on the system of electing the president of France through universal suffrage as opposed to by vote of the Assembly.

[2] Fresneau voted for reinstatement of the bond, for prosecution of Louis Blanc and Marc Caussidière, against the Jules Grévy amendment to make the president subordinate to the Assembly, against the right to work, for the agenda in honor of General Louis-Eugène Cavaignac, against reduction of the salt tax, against amnesty, for prohibition of clubs, for credits of the Rome expedition and against the abolition of the tax on drinks.

[3] He continued to oppose the republican regime, and voted for the state of siege, for prosecution of the representatives compromised in the 13 June affair and for the law of 31 May restricting universal suffrage.

[2] During the French Third Republic Fresneau was elected to represent the Morbihan department on 8 February 1871, and sat with the Extreme Right group.

[2] In 1873 Fresneau voted for the resignation of Thiers, and then fully associated himself with the ministry of Albert de Broglie, and for restoration of the monarchy.

However, he turned against the de Broglie ministry and contributed to its fall in May 1874 when he became convinced that the Orléanists had obstructed recognition of Henri, Count of Chambord as king.

He fiercely opposed the laws on education presented by Jules Ferry, and again raised the question of religion in an interpellation concerning a decision of the Besançon and Douai academic councils.

[2] On 10 December 1882 he questioned Jules Duvaux, Minister of Public Education, about the suppression of religious symbols in school premises.

He defended the surtax on cereals and import duties on cattle, attacked the government's financial management, discussed secularization of primary education, tried to delay the Franco-Italian tade treaty and voted against modification of the judicial oath, against the reform of the staff of the judiciary, against the law of divorce, against the expulsion of the princes and against the new military law.

He voted against the draft Lisbonne law to restrict the freedom of the press, and against the Senate process to judge attacks against the security of the state by General Georges Ernest Boulanger.

[4] In 1890 Fresneau condemned the action of Minister of Education and Fine Arts, Léon Bourgeois, in secularizing the Vicq school.

On 6 February 1891 he objected to a statue of Jean-Paul Marat that the municipality of Paris had erected, which he said "glorified the crimes of terrorists and the Terror."

On 25 March 1892 he denounced the appointment of the positivist Pierre Laffitte, a disciple of Auguste Comte, as professor of the general history of science at the Collège de France.