Italian right-wing leader Matteo Salvini will go on trial for "kidnapping" migrants in September for his decision in 2019 as interior minister not to allow an NGO ship packed with migrants dock in an Italian port.

Salvini’s nationalist League (Lega) formed part of a coalition government between 2018 and 2019 with the populist 5-Star Movement. In that role, Salvini launched a crackdown against illegal migration from Africa, which was assisted by NGO migrant ships that would pick up migrants in the Mediterranean then bring them to Italy.

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In this Feb. 12, 2020 file photo, then opposition leader Matteo Salvini speaks at the end of the debate at the Italian Senate on whether to allow him to be prosecuted. (AP Photo/Andrew Medichini, file)

In this Feb. 12, 2020 file photo, then opposition leader Matteo Salvini speaks at the end of the debate at the Italian Senate on whether to allow him to be prosecuted. (AP Photo/Andrew Medichini, file)

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Salvini accused the groups of encouraging illegal migration and called on the E.U. to assist Italy in combating the flow of migrants from Libya. In that role, Salvini was one of the most prominent nationalist-populist leaders to take office after the 2015 migrant crisis that rocked the continent.

As part of that fight, he refused to allow the rescue ship, run by the NGO Open Arms, to dock with the 147 migrants it had on board in August 2019. After a 19-day stand off, migrants remaining on board were allowed to disembark. The ship was not barred from going anywhere, other than the Italian ports.

Salvini was investigated at the time for possible kidnapping charges, and on Saturday a judge ordered him to stand trial in September. Salvini stood by his decisions while in office, and said he was going on trial with "a clear conscience."

"I’m going on trial for this, for having defended my country?" he tweeted after the decision. "I’ll go with my head held high, also in your name."

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The Spanish-based Open Arms welcomed the decision, calling it "a reminder to Europe and the world that there are principles of individual responsibility in politics."

While the League was removed from the governing coalition in 2019 after it collapsed when Salvini moved a no-confidence motion, polling suggests it is the most popular party in the country.

The Associated Press contributed to this report.