A Trump supporter who says he was beaten up for wearing a red ‘Make America Great Again’ hat outside a bar in Portland, Oregon, has slammed the city's ‘radical’ political culture after a grand jury declined to indict his alleged assailants.

Luke Lenzner slammed the decision, after a Multnomah County grand jury on Thursday said it would not prosecute Adebisi Okuneye, 23, and Leopold Hauser, 22.

‘I know who hit me, who assaulted me,’ Lenzner told The Oregonian. ‘In any other city they would have been indicted.’

Okuneye and Hauser were arrested for their role in an August 24 incident at Growler’s Taproom on Southeast Hawthorne Boulevard, where Lenzner claims he was attacked while enjoying a night out with his wife.

But cops later painted a different picture, suggesting Lenzner had been wearing the hat to get a reaction, and had been involved in a confrontation at another bar earlier in the evening.

Pictures show Luke Lenzner, 34, in a red hat with Donald Trump's 2016 campaign slogan emblazoned across it with cuts and bruises to his face after an incident outside an Oregon bar in the early morning hours of Saturday, August 24

Adebisi A. Okuneye (left), 23, and Leopold A. Hauser (right), 22, were arrested and charged with third-degree assault following the incident, but a grand jury on Thursday declined to indict them

Lenzner, left, says he was 'sucker punched' on a date night with his wife, right

Lenzner said he was 'mobbed' outside the bar by people who 'just circled me and my wife'

Lenzner, an Oregon resident, said that while he still wears his red 'MAGA' hat around his neighborhood, he has no plans to return to Portland - one of America's most liberal cities.

'It’s just one more reason to move out of this state,' he said.

While on a date with his wife in the Northwest city, Lenzner, 34, says he was 'sucker punched' outside the bar in the early hours of August 24 while wearing his 'Make America Great Again' cap.

News of the incident gained national attention after photos circulated online showing Lenzner with a black eye and bloody face.

Security footage shows Lenzner appear to point at his hat and say something to other patrons

Lenzner told FOX 12 he was 'mobbed' outside the bar by people who 'just circled me and my wife'.

Security footage shows the couple as they leave the bar. Lenzner appears to point at his hat and say something to other patrons before the altercation.

Staff at the Growler's Taproom said they had told Lenzner and his wife they had stopped serving food.

After leaving Lenzner claims it was then he was attacked. He said: 'Yep, hitting my square on the face.

'Surrounding me, like literally surrounding me, pushing me. I'm just trying to get through, trying to stop the person from hitting me, from taking my hat, and then I get sucker punched.'

Lenzner said he has been left with bruising and cut to his arms and face.

Hauser and Okuneye are said to have fled before police arrived but Lenzner was able to give officers a license plate.

They were arrested a few blocks away.

Lenzner, pictured with his wife, says he has been left with bruising and cut to his arms and face

The images of Lenzner's bruised and bloodied face sparked outrage, particularly among Trump supporters.

But authorities painted a more complicated picture.

Lenzner’s wife told police that she and her husband visited a number of local bars that night because they were curious as to how Portlanders would react to him wearing the ‘MAGA’ hat.

Police documents indicate that she asked Lenzner to wear the hat in order to gauge the reaction of locals.

According to court records, Hauser told police that he and his friends at the bar took offense to Lenzner’s hat and were staring him down.

Okuneye reportedly told police that Lenzner came out of the bar and approached her.

She claims he called her an expletive and asked her: ‘How do you like my hat?’

Lenzner told police that Okuneye ‘got in his face.’ He then pushed Okuneye away to create space between them, he said.

It is at this point that Lenzner claims Hauser punched him in the face, according to court records.

It was later learned that Lenzner was filmed confronting patrons at other bars that he visited earlier that day in Portland.

‘The second I locked eyes with him there was no doubt in my mind he was looking for a fight,’ Michael Radosevich told The Oregonian.

Radosevich captured video showing Lenzner yelling expletives at customers inside The Vern in the late night hours of Friday, August 23 - just hours before he says he was attacked.

In the video, Lenzner is seen yelling at patrons while claiming he served in the military - which he later admitted to police was not true.

When a number of patrons ask Lenzner to leave the bar, he is heard saying: ‘Come outside and see what happens.’

‘No one wants to fight,’ Radosevich told Lenzner.

Lenzner eventually leaves.

He later told KATU that he misspoke when he claimed to be in the military. He added: 'I should [have] said my family serves and served, that's what I wanted to say but in the heat of the moment it came out wrong.'

Portland is well knows for its liberal and progressive policies, and has been the site of numerous political clashes involving activists from Antifa.

Last month, hundreds of activists from both Antifa and the far-right Proud Boys staged a demonstration and counter-demonstration in Portland.

Although the events were largely peaceful, about a dozen people were arrested and a few suffered minor injuries.