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There is "no Slovenia without the Slovenian nation", SDS leader Janez Janša said in his address, stressing that the well-being of Slovenian citizens would always be the top priority for the party.
The "degenerated left," on the other hand, is "inviting migrants from completely different civilisational backgrounds. We do not accept that."
"We want to be friends with all nations, but we also know who we are," he said in a brief keynote.
The event also featured addresses by European People's Party (EPP) leader Manfred Weber, Hungarian Prime Minister Viktor Orban and the head of the Macedonian opposition VMRO-DPMNE, Hristijan Mickoski.
They attended the convention to express their support for the party in general and Janša in particular. As Weber put it, "we want to contribute to Janez Janša becoming the next prime minister of Slovenia".
Their speeches reflected topics dear to European conservatives, with both Weber and Orban emphasising how important it was to preserve the Christian roots of European identity.
Weber said that Europe as a Christian continent must help regions of the world like Africa, but it must also protect its borders.
He said Europe was a continent of diverse languages and traditions, but one thing that all nations share in common is Christianity. "In the centre of every city [in Europe], you will find a Christian Church," he pointed out.
However, he also stressed that Europe must stand united to face challenges posed by the likes of China, Russia and even the United States. "The only answer is for us Europeans to stick together," he stressed.
Orban, speaking in Hungarian, said that since 2015 the Europe has faced tough choices and had had to take tough decisions.
He said the migration crisis of 2015 was only a prelude of what could happen in the future, as millions from Africa wanted to come to Europe, and if Europe was not careful its citizens risked losing their countries.
"They want to settle among us people who are not a part of out culture and who want to live according to their customs and religion... Hungarians are Christians and want to help, but not by letting them come to our country."
Orban suggested that Janša was the right person to lead the country in such times, as decisions that needed to be taken "cannot be entrusted to parties without a past".
"In this battle we need experienced warriors ... capable of building strong parties. The SDS is such a party," he said, labelling the SDS a "sister party" of Fidesz.