"All my solidarity. No to sanctions and to trials of freely elected governments", read the post by Salvini, who is also Italy's Deputy Prime Minister.
But it was still unclear whether the 751-strong European Parliament would be able to muster the two-thirds majority needed to pass the censure motion, which accuses Hungary of breaching core EU values.
Earlier on Wednesday, the European Parliament greenlighted triggering of the Article 7 against Hungary with 448 votes in support against 197 counter votes.
"This decision condemning Hungary and the Hungarian people was made because we Hungarians have demonstrated that migration in not a necessary process and that migration can be stopped", Szijjarto told reporters in Budapest.
"This is a historic result for Hungarian citizens and for European citizens everywhere, that the European Parliament has voted by a large majority to stand up for the values we all hold dear", Sargentini said.
The official argued that the votes of those who abstained were not taken into account, which swung the outcome of the voting.
For years, Orban has successfully deflected much of the global condemnation about Hungary's electoral system, press freedoms, independence of the judiciary, mistreatment of asylum seekers and refugees and limitations on the functioning of non-governmental organizations, but criticism has been growing even within the European People's Party, to which his Fidesz party belongs. The ultimate sanction, the suspension of Hungary's voting rights in the European Union, is unlikely as Poland is set to veto that move.
Prime minister Viktor Orban said Sargentini's report was "abuse of power and included 'serious factual misrepresentations".
The MEP said Hungary was going to challenge the vote in the parliament - an issue that could end up at the EU's top court.
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"The truth is that the verdict has already been written", Orban said.
"I reject that the pro-immigration and pro-migrant forces of the European Union should threaten and blackmail and smear Hungary and the Hungarian people based on false allegations", Orban said.
With Britain about to leave the bloc altogether in March and Europeans voting in European Parliament elections in May, the row over Hungary - and Poland, which faces a similar sanctions procedure launched by the executive European Commission in 2017 - highlights tensions between nationalist and federalist camps.
"You say no more than the Hungarian people cannot decide for themselves what is in their own interest".
The EPP membership has muted European Union reaction to Orban's policies over the years and the big question mark is what the group's 217 members will now do.
Also on Tuesday night Orban also faced the prospect of his party being kicked out of the right-wing party group in the European parliament.
Aside from its anti-immigrant stance, Orban's government is also accused of silencing independent media and academia, removing independent judges, cracking down on organisations helping homeless people, migrants or disadvantaged groups, such as Roma, and condoning government corruption.
Their decision was made even more contentious when members of the EPP, the centre-right political group of Orban's Fidesz party, announced Tuesday that they would support the report.