At a news conference with worldwide media two days after cruising to his third straight term, Orban said his government had already drawn up a "Stop Soros" package of legislation.
With nearly all votes counted, a two-party coalition led by Mr Orban's Fidesz party had captured 134 of 199 seats in parliament, one more than the two thirds of seats required to amend the constitution.
After a campaign centred on resistance to immigration and trumpeting a strong economy, near-complete results showed that Mr. Orban's Fidesz party snapped up nearly half the vote (48.8%).
"Hungary continues to stand on constitutional foundations", he told reporters.More news: Take Two: Cubs Prepare For Postponed Home Opener
The proposed bill gained its name after the US-Hungarian philanthropist George Soros, who has promoted the rights and welfare of asylum seekers and migrants around the world.
In a speech last month, Orban had said he would take unspecified "moral, political and legal" measures against his opponents in the event of a Fidesz victory, prompting fears of a clampdown on opposition.
Hungarian Prime Minister Viktor Orban said on Tuesday his landslide re-election had given him a powerful mandate to restrict migrant rights and seek a European Union of independent nations rather than a "United States of Europe".
The mission also raised concerns about "hostile and intimidating campaign rhetoric, limited space for substantive debate and diminished voters' ability to make an informed choice", he said.More news: Richie Incognito tweets "I'm done"
Once approved, the laws would force the civic groups - some supported by Soros's Open Society Foundations - to get government permits, and income they receive from overseas would be taxed. "For me, these two relations will be the favored relations in the future".
Chancellor Angela Merkel's response contrasted sharply with that of Seehofer, who as Bavarian prime minister was her chief antagonist during the migration crisis of 2015-2016.
Orban is fervently anti-migration and based his re-election campaign on the demonization of the mainly Muslim migrants coming to Europe.
According to the Orban government, Hungary will descend into chaos should it become an "immigrant country" like France or Belgium, with funds meant for Hungarian families or the country's underprivileged Roma minority diverted to migrants, whose presence will weaken Hungary's security and increase its terror risk. "This applies to Germany, too, but I was elected not by the German people but by the Hungarians".More news: Trump's Call For National Guard Troops At The Border Falling Flat
"We are grateful for the observations", he said.
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