Serbian President Aleksandar Vucic is asking Australian Prime Minister Scott Morrison why Novak Djokovic is being harassed in Australia. On Friday, Australian Immigration Minister Alex Hawke exercised his powers to cancel the visa of Djokovic. Serbian President Vucic reacted to the news by posting a four-minute clip on Instagram that was titled “Support for Novak Djokovic and response to the Prime Minister of Australia.” “If you wanted to forbid Novak Djokovic to win the [Australian Open] trophy for the 10th time, why didn’t you return him immediately, why didn’t you tell him that it was impossible to get a visa?” Vucic asked in the clip, as quoted on ABC. “Why do you mistreat him, why do you torture him, as well as his family and [a] nation that is free and proud? “Is all this necessary to win the elections and please your public? “A president of a small countr …