[9] In 2011, following Fidesz's supermajority victory at the Hungarian polls one year earlier, Áder helped draft legislation modifying Hungary's judiciary and electoral laws; the former was challenged (but upheld) before the European Court of Justice.

[8] János Áder met Shimon Peres at a working dinner in Jerusalem on 15 July 2012, and invited the Israeli President for an official visit to Hungary.

Áder told that their conversation had focused on deepening scientific cooperation between the two countries, in which Hungary could benefit from Israel's experience in areas such as farming and water management.

[11] Later, The Simon Wiesenthal Centre asked Áder in an open letter sent to MTI to help bring alleged Nazi war criminal László Csizsik-Csatáry to justice "as quickly as possible".

These include Article P, which states that "natural resources, especially the farmland, forests and the drinking water supplies, the biodiversity – in particular native plant and animal species – and the cultural assets shall form part of the nation's common heritage; the State and every person shall be obliged to protect, sustain and preserve them for future generations".

He stated that he had made his decision in view of his promise that as President of Hungary he would carry out the responsibilities conferred on him by the constitution without fail.

Some days earlier the Serbian lawmakers adopted a declaration, which condemned the massacre in Vojvodina in 1944-45 and resolutions made under the principle of collective guilt during the war.

[19] Opposition news portal Index claimed Áder intended to candidate for the position of Secretary-General of the United Nations during the 2016 selection process to succeed Ban Ki-moon, and his climate policy and efforts were part of his international campaign.

"[21] He welcomed the ratification of the Paris Agreement, which he called a very important step for Hungary, as "the Carpathian Basin is more affected by climate change than several other European countries," he said.

[22] In June 2016, Áder wrote a letter to the heads of state of the world's top ten carbon dioxide-emitting countries to persuade them to tighten their reduction targets.

Jobbik politician Lajos Kepli accused Áder, as while he fights for the interests of environmental protection at the international level, he failed to criticize the Orbán government for their precluding domestic policy.

"[Áder] sees no problem with the taxation on solar panels, he is not bothered by the arbitrary cessation of energy efficiency tenders [...]," Kepli argued.

[23] In contrast to his predecessor Schmitt, who during his presidency of almost two years did not send any bill which had been voted on by the National Assembly back for consideration by the legislature, nor submit any to the Constitutional Court for judicial review, Áder proved to be a counterweight to the Orbán government on a number of important issues.

"[28] On 8 December 2016, opposition media outlet ATV claimed that Orbán was grooming Minister of Human Resources Zoltán Balog to succeed Áder.

ATV added that Áder's neutrality during the October 2016 migrant quota referendum campaign had harmed the "relationship of trust" between him and Orbán.

[39] The Hungarian parliament passed the law granting plenary power to the Government which authorizes it to override acts and to rule by decree to the extent that is "necessary and proportional" in order to "prevent, manage, and eradicate the epidemic and to avoid and mitigate its effects", on 30 March 2020.

[44][45] In April 2021, President János Áder and First Lady Anita Herczeg established a charity foundation in order to financially support those orphaned children who lost their parents during the COVID-19 pandemic.

Their foundation was named after Catholic priest and Righteous Among the Nations István Regőczi, who taught and cared for World War II orphans.

Beside Áder and his wife – who made the first donation, altogether 5 million HUF (EUR 13,850) – clinical psychologist Emőke Bagdy and climate researcher Diana Ürge-Vorsatz became members of the board of trustees.

Journalist Szabolcs Panyi concluded that "the most likely reason [of the wiretapping] was the conflict between the various law enforcement agencies, which took a bitter turn when the Counter Terrorism Centre (TEK) wanted to know the details of Áder's schedule."

[48] According to an analysis of independent news portal Telex.hu, Áder did not become a counterweight to the Orbán governments with two-thirds majority; most of the cases (most of them were "indifferent" laws) he only complained about formal issues and not about the content.

[50] János Áder has a sister, Annamária (born 1960), a biology and geography high school teacher, who married footballer and manager Gábor Pölöskei.