Presumptive Republican presidential nominee Donald Trump has courted a lot of controversy with his contentious positions on immigration, Muslim Americans and other divisive issues. And his outrageous statements have courted a number of unsettling supporters. Here are five Trump endorsements that will keep you up at night.

1. The Ku Klux Klan

Unlike the other groups on this list, the KKK - which has the dubious honor of being called America's oldest hate group - likely needs no introduction. Last April, a Virginia NBC affiliate sat down with the "Imperial Wizard" of a klan chapter to ask whom he would support in the 2016 election.

The anonymous leader said, "I think Donald Trump would be best for the job. The reason a lot of Klan members like Donald Trump is because a lot of what he believes in, we believe in. We want our country to be safe."

2. Alexander Dugin

twitter / @Katerhon_es

This Russian political science professor has been a member of organizations such as the National Bolshevik Party, an outlawed group that frequently accused of promoting extremism and hatred.

Dugin himself wants his homeland to annex territories that once belonged to the Russian Empire. You could say he wants to "make Russia great again." But that's just the first stage of his megalomaniacal dream. According to Max Fisher of Vox, Dugin believes that "Russia should lead a grand Eurasian empire based on ultra-Orthodox Christianity and conservative communitarian values. This empire must defend against, and will necessarily come into conflict with, decadent Western civilization."

The prospect of a war between east and west makes Dugin's endorsement of Trump particularly unsettling: "Trump is a leader," he wrote in March. "We want to put trust in Donald Trump. Vote for Trump and see what will happen."

3. Nick Griffin

As leader of the British National Party from 1999-2014, Griffin fought to make the BNP electable by distancing it from its racist roots. That was a tall order. Less than a decade earlier, the European Parliament accused BNP of being a British Nazi party. Rather than back down, then Deputy Director Richard Edmonds said, "We are 100 percent racist, yes." He also praised Nazi stormtroopers as, "fine , brave men who fought the whole world for five years."

By convincing skinheads to wear suits and run for office instead of rioting, Griffin had success courting voters who were disillusioned with Labour and the Tories. But in 2014 he was kicked out after being accused of bringing the party into disrepute (among other things).

Since then, Griffin has reemerged on the political scene to stump for Trump on Twitter:

4. Geert Wilders

The leader of the Dutch ultra-rightwing Party for Freedom has advocated for banning the Quran from the Netherlands, halting immigration from Muslim nations and paying Muslim immigrants to go, "back where they came from." Yet he doesn't like being called racist.

"I have a problem with Islamic tradition, culture, ideology. Not with Muslim people," he told The Guardian in 2008. "Islam is not a religion, it's an ideology - the ideology of a retarded culture...I don't create hate. I want to be honest. I don't hate people. I don't hate Muslims. I hate their book and their ideology."

But he loves the Stars and Stripes as well as Trump. In December 2015, he endorsed The Donald with the following tweet.

5. Ilias Panagiotaros

Some dubious Trump endorsers are also defenders of The Donald.

Last February, Trump fell for a trap set by Ashley Feinberg of Gawker, who created a "Fascist bot" account on Twitter that tweeted Benito Mussolini quotes to Trump's account. Her hypothesis was that Trump was so self-centered that he would retweet anything that sounded like praise - regardless of the source. John Cook - Gawker Media Executive Director - thought that the ploy was too obvious to work considering the bot was named @ilduce2016.

But The Donald didn't disappoint.

And instead of apologizing for the gaffe, he insisted that it was "a very good quote" despite the context.

He received praise for his handling of the situation from Ilias Panagiotaros - member of the Golden Dawn Party, a Greek neo-Nazi organization that identifies with Trump's views on immigration. Panagiotaros praised Trump for the Mussolini quote, for attacking Pope Francis and for his general outspokenness.

"He doesn't fear to speak the truth," Panagiotaros said in a vlog featuring clips of Trump alongside the Golden Dawn's swastika-inspired emblems. "[T]he man who calls a spade a spade becomes vindicated in the end."

6. Benito Mussolini

After tricking Trump, the team at Gawker photoshopped The Donald's distinct coiffeur onto their profile pic of "Il Duce."

h/t CNN, The Hill, BBC, Independent